Intelligent range hood and control method thereof

Abstract

The invention relates to an intelligent range hood and a control method thereof.The range hood comprises a sampling air duct vertically arranged on the inner side face of a box, the bottom of the sampling air duct is provided with an air inlet, a heating module and a first temperature sensor, the middle of the sampling air duct is provided with an air detection module, and the top of the sampling air duct is provided with an air outlet and a second temperature sensor; the controller is connected with the heating module, the air detection module and the exhaust fan and used for controlling the heating module to heat and controlling the air detection module to start under the condition that the temperature difference between the first temperature detected by the first temperature sensor and the environment temperature detected by the second temperature sensor is larger than or equal to a first threshold value. And the exhaust fan is controlled to run at the corresponding gear based on the concentration value detected by the air detection module, the accuracy and timeliness of concentration value detection are improved, and the exhaust fan is controlled to run at the corresponding gear through the concentration value, so that oil smoke is exhausted in time, and the condition of a large amount of oil smoke is avoided.

Description

Technical Field

[0001] This application relates to the field of smart home appliance technology, and in particular to a smart range hood and its control method. Background Technology

[0002] With the popularization of smart home appliances, smart functions are being incorporated into range hoods more and more widely. Among them, air detection sensors are popular among users because they can detect gas leaks and harmful particulate matter in the kitchen, effectively reducing PM2.5 pollution and greatly improving the kitchen environment. In recent years, this function has become increasingly common in range hood products.

[0003] In related technologies, the air detection sensors of range hoods are mostly located on the top or side of the range hood. However, the heavily soiled area of ​​kitchen grease and grime is concentrated above the stove, which makes it impossible to detect the air conditions in that area. Or, by the time the sensors are detected, the kitchen is already covered with grease and grime, resulting in delayed detection results. On the other hand, sensors located on the front are frequently in contact with grease and grime, causing the probe surface to become contaminated. Due to structural limitations, they cannot be cleaned or there are no maintenance reminders, causing the function to fail after a period of use and resulting in false alarms.

[0004] Because existing air detection sensors suffer from delays and false alarms, range hoods cannot remove fumes in a timely manner, resulting in a large amount of fumes in the kitchen environment. Summary of the Invention

[0005] Therefore, it is necessary to provide an intelligent range hood and its control method to address the aforementioned technical problems.

[0006] In a first aspect, embodiments of this application provide an intelligent range hood, including a housing and an exhaust fan, the range hood further including:

[0007] A sampling air duct is vertically installed on the inner side of the box. The bottom of the sampling air duct is equipped with an air inlet, a heating module and a first temperature sensor, the middle is equipped with an air detection module and the top is equipped with an air outlet.

[0008] The controller is connected to the heating module, the air detection module, and the exhaust fan. It controls the heating module to heat the air, and controls the air detection module to start working when the temperature difference between the first temperature detected by the first temperature sensor and the ambient temperature is greater than or equal to a first threshold. It also controls the exhaust fan to operate at the corresponding speed based on the concentration value detected by the air detection module.

[0009] In one embodiment, the sampling duct is provided with micro differential pressure sensors at both the upper and lower ends of the duct wall, and the micro differential pressure sensors are used to detect the pressure difference between the upper and lower ends of the sampling duct.

[0010] The controller is also used to control the exhaust fan to operate at the corresponding speed based on the concentration value when the pressure difference between the two ends of the air duct is greater than or equal to the second threshold.

[0011] In one embodiment, the air detection module is equipped with a third temperature sensor;

[0012] The controller is also used to compensate the concentration value detected by the air detection module based on the second temperature detected by the third temperature sensor, and to control the exhaust fan to operate at the corresponding speed based on the compensated concentration value.

[0013] In one embodiment, a sampling hole is provided on the inner wall of the sampling duct, and the probe of the air detection module extends into the interior of the sampling duct through the sampling hole.

[0014] In one embodiment, a honeycomb protective mesh is provided on the outer side of the air inlet.

[0015] In one embodiment, a conical diffuser is provided on the outer side of the air outlet.

[0016] In one embodiment, the inner wall of the sampling duct is provided with a nano-oleophobic coating.

[0017] Secondly, embodiments of this application provide a control method for an intelligent range hood, applied to the range hood described in the first aspect above, the method comprising:

[0018] When the range hood is in standby or low-speed operation, the heating module is controlled to heat up;

[0019] Determine whether the temperature difference between the first temperature detected by the first temperature sensor and the ambient temperature detected by the second temperature sensor is greater than or equal to a first threshold. If so, control the air detection module to start working.

[0020] Based on the concentration value detected by the air detection module, the exhaust fan is controlled to operate at the corresponding speed.

[0021] In one embodiment, the exhaust fan has a low-speed setting, a medium-speed setting, and a high-speed setting, and the setting for controlling the operation of the exhaust fan based on the concentration value detected by the air detection module includes:

[0022] If the concentration value is less than the first preset value, the exhaust fan is controlled to run at a low speed.

[0023] If the concentration value is greater than or equal to the first preset value and less than the second preset value, then the exhaust fan is controlled to operate at medium speed.

[0024] If the concentration value is greater than or equal to the second preset value, the exhaust fan is controlled to operate at high speed.

[0025] In one embodiment, the air detection module is equipped with a third temperature sensor, and the control of the exhaust fan's operation at a corresponding speed based on the concentration value detected by the air detection module includes:

[0026] The concentration value detected by the air detection module is compensated based on the second temperature detected by the third temperature sensor, and the exhaust fan is controlled to operate at the corresponding speed based on the compensated concentration value.

[0027] The aforementioned intelligent range hood and its control method utilize thermal buoyancy in the sampling duct to achieve sampling without moving parts, and overcomes the problem of detection delay through bottom temperature positioning sampling and temperature gradient control. Furthermore, the air detection module has a self-cleaning mechanism; the hot airflow generated by the heating module during sampling bakes the surface of the air detection module, preventing oil mist and water vapor condensation and avoiding false alarms. This improves the accuracy and timeliness of kitchen air concentration values. The controller controls the exhaust fan to operate at the corresponding speed based on the concentration value detected by the air detection module, thereby promptly removing oil fumes and preventing excessive oil fume accumulation in the kitchen environment.

[0028] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 This is a schematic diagram of the installation position of the sampling air duct on the range hood in one embodiment;

[0031] Figure 2 This is a schematic diagram of the installation position of the sampling air duct on the range hood in another embodiment;

[0032] Figure 3 This is a schematic diagram of the movement of the sampling airflow during operation of the sampling duct in one embodiment;

[0033] Figure 4 This is a three-dimensional structural diagram of the sampling air duct in one embodiment;

[0034] Figure 5 This is a structural block diagram of the sampling air duct in one embodiment;

[0035] Figure 6This is a schematic diagram illustrating the principle of using a micro differential pressure sensor to determine the validity of concentration data in one embodiment.

[0036] Figure 7 This is a flowchart illustrating the control method of an intelligent range hood in a preferred embodiment.

[0037] Among them, 100 is the housing; 200 is the main air duct; 300 is the sampling air duct; 301 is the air inlet; 302 is the heating module; 303 is the first temperature sensor; 310 is the air detection module; 304 is the air outlet; 305 is the second temperature sensor; 306 is the honeycomb protective net; 307 is the conical diffuser; 308 is the micro differential pressure sensor; and 309 is the third temperature sensor. Detailed Implementation

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of the present invention. For those skilled in the art, the present invention can be applied to other similar scenarios based on these drawings without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0039] As indicated in this invention and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0040] While this invention makes various references to certain modules in an apparatus according to embodiments of the invention, any number of different modules can be used and run on a computing device and / or processor. Modules are merely illustrative, and different aspects of the apparatus and methods may use different modules.

[0041] It should be understood that when a unit or module is described as "connected" or "coupled" to other units, modules, or blocks, it may refer to a direct connection or coupling, or communication with other units, modules, or blocks, or the presence of intermediate units, modules, or blocks, unless the context explicitly indicates otherwise. The term "and / or" as used herein may include any and all combinations of one or more of the related listed items.

[0042] This application provides an intelligent range hood; please refer to [link / reference]. Figures 1 to 4The range hood includes a housing 100, a main air duct 200, and an exhaust fan. The range hood also includes a sampling air duct 300 vertically installed on the inner side of the housing and a controller. Figure 1 and Figure 2 This is a schematic diagram showing the installation position of the sampling duct 300 on the range hood from different angles in the embodiments of this application. Figure 3 This is a schematic diagram of the movement of the sampling airflow during operation of the sampling duct in this embodiment of the application. Figure 4 This is a three-dimensional structural diagram of the sampling air duct in an embodiment of this application. For example... Figures 1 to 4 As shown, the sampling duct 300 has an air inlet 301, a heating module 302, and a first temperature sensor 303 at its bottom; an air detection module 310 (a TVOC sensor) in the middle; and an air outlet 304 and a second temperature sensor 305 at its top. Furthermore, a honeycomb protective mesh 306 is provided at the bottom of the duct, and a conical diffuser hood 307 is provided at the top. In this embodiment, a vertical, independent sampling duct with openings at both the top and bottom is installed on the side of the range hood housing, isolated from the main duct of the range hood. A miniature heating module (such as a low-power PTC ceramic heater) is installed at the bottom of the sampling duct near the stovetop. The heating module only activates when the range hood is in standby or running at low speed, causing the air at the bottom of the sampling duct to rise due to the thermal buoyancy effect or chimney effect of the flue gas, forming a self-circulating airflow. It actively draws air from the bottom of the kitchen (the area where pollutants tend to accumulate) up using the thermal buoyancy effect or chimney effect of the flue gas and flows through the air detection module in the middle of the sampling duct. The TVOC sensor detects the concentration of gas leaks and harmful particulate matter (TVOC concentration) in the kitchen.

[0043] The sampling duct 300 can be integrated into the side panel interlayer of the housing 100, leaving only the air intake grille externally. This does not affect the overall space of the unit and ensures installation compatibility. Furthermore, actual measurement data shows that the TVOC concentration at the bottom of the kitchen is 3 to 5 times higher than at the top (because the density of gas combustion products is greater than that of air), thus improving the accuracy of detection.

[0044] The controller is electrically connected to the heating module, the air detection module, and the exhaust fan. In the use scenario of the smart range hood, the controller first detects the status of the range hood. If the controller detects that the range hood is running at high speed, it will not perform any action. When the controller detects that the range hood is in standby, low speed, or medium speed operation, or can be selected via the mode selection key, when the range hood is selected to intelligent control mode, it sends a control command to control the heating module to heat. The first temperature sensor detects the temperature at the bottom of the sampling duct and sends the detected first temperature to the controller. At the same time, the second temperature sensor detects the temperature at the top of the sampling duct (i.e., the ambient temperature) and sends the detected ambient temperature to the controller. The controller receives the first temperature and the ambient temperature, calculates the temperature difference between the first temperature detected by the first temperature sensor and the ambient temperature. When the temperature difference between the first temperature and the ambient temperature is greater than or equal to a first threshold, it indicates that the chimney effect activation condition has been met. Therefore, when the temperature difference between the first temperature and the ambient temperature is greater than or equal to the first threshold, the controller sends a control command to control the air detection module to turn on and perform air concentration detection. The air detection module sends the detected concentration value to the controller. Based on the concentration value detected by the air detection module, the controller controls the exhaust fan to operate at the corresponding speed, thereby timely removing oil fumes and avoiding a large amount of oil fumes in the kitchen environment.

[0045] The exhaust fan has three speed settings: low speed, medium speed, and high speed. If the controller determines that the concentration value is less than a first preset value, it controls the exhaust fan to operate at low speed. If the concentration value is greater than or equal to the first preset value and less than a second preset value, it controls the exhaust fan to operate at medium speed. If the concentration value is greater than or equal to the second preset value, it controls the exhaust fan to operate at high speed.

[0046] The sampling duct designed in this embodiment utilizes thermal buoyancy to achieve sampling without moving parts, and overcomes the problem of detection delay through bottom temperature positioning sampling and temperature gradient control. Furthermore, the air detection module has a self-cleaning mechanism; the hot airflow generated by the heating module during sampling bakes the surface of the air detection module, preventing oil mist and water vapor condensation and avoiding false alarms. This improves the accuracy and timeliness of kitchen air concentration values. The controller controls the exhaust fan's operation at the corresponding speed based on the concentration value detected by the air detection module, thereby promptly removing oil fumes and preventing excessive oil fume accumulation in the kitchen environment.

[0047] In one example embodiment, the sampling duct has a cross-section of 20mm×20mm and a height of 200mm (length-to-diameter ratio of 10:1 to enhance the chimney effect). The heating module uses 5W PTC ceramic, and the distance between the bottom air inlet of the sampling duct and the stove surface is 45cm-55cm (the pollution accumulation zone around 50cm on the stove surface).

[0048] The principle of thermal buoyancy is as follows:

[0049] The first temperature T was collected by the first temperature sensor installed at the bottom of the sampling duct. bot The ambient temperature T was collected by the second temperature sensor mounted on the top. env Temperature difference ( =T bot -T env ), to determine whether the conditions for the chimney effect to take effect have been met, when At that time, T k This is a threshold constant, indicating that the conditions for the chimney effect to take effect are met. For example, when the temperature difference... The chimney effect activation condition is met at ≥10℃.

[0050] Physical principle: According to the ideal gas law, temperature difference Causes air density difference (ambient air density ρ) env >Air density ρ at the bottom of the air duct bot ), generating buoyancy, airflow velocity calculation model:

[0051]

[0052] : Airflow velocity at the center of the sampling duct (m / s)

[0053] Acceleration due to gravity (9.8 m / s²)

[0054] Effective height of the air duct (0.2m)

[0055] Temperature difference between inside and outside the air duct (°C)

[0056] Ambient temperature (absolute temperature in Kelvin)

[0057] For example: when the ambient temperature in the kitchen is 25℃ ( =298K), cooking or auxiliary heating causes the temperature T collected by the first temperature sensor at the bottom of the air duct to be 298K. bot Up to 50℃ ( At 25℃, the airflow velocity v is:

[0058]

[0059] Corresponding traffic It can complete the bottom air refresh sampling of a typical kitchen (10m³) within 12 minutes. A is the cross-sectional area of ​​the sampling duct.

[0060] In a further embodiment, a sampling hole is provided on the inner wall of the sampling duct, and the probe of the air detection module extends into the interior of the sampling duct through the sampling hole.

[0061] In a further embodiment, a honeycomb protective mesh is provided on the outer side of the air inlet.

[0062] In a further embodiment, a conical diffuser is provided on the outer side of the air outlet.

[0063] In a further embodiment, the inner wall of the sampling duct is provided with a nano-oleophobic coating.

[0064] Figure 5 This is a structural block diagram of a sampling duct in one embodiment of this application, as shown below. Figure 5 As shown, the sampling duct has a honeycomb protective mesh 306 at the bottom, an air inlet 301 at the top, a heating module 302 and a first temperature sensor 303, an air detection module 310 in the middle (including a TVOC sensor and a third temperature sensor 309), a second temperature sensor 305 and an air outlet 304 at the top, and a conical diffuser 307 installed at the top air outlet. Simultaneously, micro-differential pressure sensors 308 are installed at both ends of the sampling duct wall. The vertical pipe of the sampling duct is made of aluminum alloy with a nano-oleophobic coating on the inner wall to ensure a smooth surface that does not attract oil droplets. Holes are opened in the inner wall of the duct, allowing the TVOC sensor probe to penetrate into the duct for real-time detection of the concentration of volatile organic compounds in the air, converting it into a measurable electrical signal.

[0065] To prevent false readings from the TVOC sensor, in one embodiment, the range hood incorporates an airflow detection function. Micro-differential pressure sensors 308 are installed at both ends of the sampling duct wall. These sensors detect the pressure difference between the upper and lower ends of the sampling duct. Figure 6 As shown, the pressure difference between the upper and lower ends of the air duct is collected by a micro differential pressure sensor. , will pressure difference With the second threshold (e.g., for) Compare the data detected by the TVOC sensor to determine its validity. If the pressure difference is... If the data is greater than or equal to the second threshold, it indicates that the data detected by the TVOC sensor is valid; otherwise, it indicates that the data detected by the TVOC sensor is invalid.

[0066] Verifying airflow using Bernoulli's principle:

[0067]

[0068] Pressure difference (Pa) between the two ends of the air duct

[0069] Air density (1.2 kg / m³)

[0070] Airflow velocity (m / s)

[0071] When detected (correspond When this occurs, the data output detected by the TVOC sensor is frozen.

[0072] Specifically, the controller is used when the range hood is in standby, low-speed, or medium-speed operation. Alternatively, it can be selected via a mode selection key. When the range hood is selected in intelligent control mode, the controller controls the heating module to heat up. If the temperature difference between the first temperature detected by the first temperature sensor and the ambient temperature is greater than or equal to a first threshold, the controller controls the air detection module to start working. If the pressure difference between the upper and lower ends of the duct is greater than or equal to a second threshold, the controller controls the exhaust fan to operate at the corresponding speed based on the concentration value detected by the air detection module. If the pressure difference between the two ends of the duct is less than the second threshold, the controller does not control the exhaust fan accordingly.

[0073] To further improve the accuracy of kitchen air concentration data detection, in one embodiment, such as Figure 4 As shown, in order to compensate for the influence of thermal gradient on the output of the air detection module, the air detection module is equipped with a third temperature sensor. The third temperature sensor detects the temperature of the air detection module and sends it to the controller. The controller compensates for the concentration value detected by the air detection module based on the second temperature detected by the third temperature sensor, and controls the exhaust fan to operate at the corresponding speed based on the compensated concentration value.

[0074] The compensated concentration value is calculated using the following formula:

[0075]

[0076] C_Actual: True concentration (ppm), i.e., the concentration value after compensation;

[0077] C_Measurement: Measure concentration (ppm), which is the concentration value measured by the air detection module;

[0078] TVOC sensor surface temperature (°C), which is the second temperature detected by the third temperature sensor;

[0079] Temperature coefficient (typical value for TVOC sensors is -0.5% / ℃).

[0080] Specifically, the exhaust fan has three speed settings: low speed, medium speed, and high speed. If the controller determines that the compensated concentration value is less than a first preset value, it controls the exhaust fan to operate at low speed. If the compensated concentration value is greater than or equal to the first preset value and less than a second preset value, it controls the exhaust fan to operate at medium speed. If the compensated concentration value is greater than or equal to the second preset value, it controls the exhaust fan to operate at high speed.

[0081] This application provides a control method for an intelligent range hood, applicable to any of the intelligent range hoods described in the above embodiments. The method includes the following steps:

[0082] Step S201: When the range hood is in standby or low-speed operation, control the heating module to heat up.

[0083] Step S202: Determine whether the temperature difference between the first temperature detected by the first temperature sensor and the ambient temperature detected by the second temperature sensor is greater than or equal to the first threshold. If so, control the air detection module to start working.

[0084] Step S203: Based on the concentration value detected by the air detection module, control the exhaust fan to operate at the corresponding speed.

[0085] The exhaust fan has low speed, medium speed and high speed. The control of the exhaust fan's operation based on the concentration value detected by the air detection module includes the following: if the concentration value is less than a first preset value, the exhaust fan is controlled to operate at low speed; if the concentration value is greater than or equal to the first preset value and less than a second preset value, the exhaust fan is controlled to operate at medium speed; if the concentration value is greater than or equal to the second preset value, the exhaust fan is controlled to operate at high speed.

[0086] In the control method of the above-mentioned intelligent range hood, the sampling duct utilizes thermal buoyancy to achieve sampling without moving parts, and overcomes the problem of detection result delay by bottom temperature positioning sampling and temperature gradient control. During sampling, the hot airflow generated by the heating module bakes the surface of the air detection module, which can also prevent oil mist and water vapor condensation and avoid the problem of false alarms in the detection results. This improves the accuracy and timeliness of the kitchen air concentration value, and controls the exhaust fan to operate at the corresponding speed based on the concentration value detected by the air detection module, thereby timely removing oil fumes and avoiding the situation of a large amount of oil fumes in the kitchen environment.

[0087] In one embodiment, the air detection module is equipped with a third temperature sensor, and the step of controlling the exhaust fan to operate at a corresponding speed based on the concentration value detected by the air detection module includes the following: compensating the concentration value detected by the air detection module based on a second temperature detected by the third temperature sensor, and controlling the exhaust fan to operate at a corresponding speed based on the compensated concentration value.

[0088] The present embodiment will now be described and illustrated through preferred embodiments.

[0089] Figure 7 This is a preferred flowchart of the control method for the intelligent range hood in this embodiment, as shown below. Figure 7 As shown, the control logic of this control method is as follows:

[0090] Upon power-on initialization, the smart range hood's controller detects its status. If the range hood is operating at high speed, effectively removing harmful gases or particles such as cooking fumes from the kitchen, no further control logic needs to be executed. If the range hood is in standby / low / medium speed operation, or when the range hood is selected in smart control mode, the controller controls the heating module to heat the food. The heating module uses PTC ceramic. The controller receives the first temperature T collected by the first temperature sensor. bot The ambient temperature T was collected by the second temperature sensor mounted on the top. env The controller determines whether the temperature difference between the first temperature and the ambient temperature is greater than or equal to a first threshold (e.g., 10℃). If so, the controller activates the TVOC sensor; otherwise, it uses a PID temperature control method to adjust the power output of the heating module. When the temperature difference is greater than or equal to the threshold, airflow effectiveness is detected, and the controller receives pressure difference data from a micro-differential pressure sensor at both ends of the duct. Determine the pressure difference ≥ the second threshold (e.g., for) If the condition is true, the controller reads the original voltage signal Vraw detected by the TVOC sensor, converts it into a concentration value C_measured, and calculates the actual concentration value C_based on the second temperature detected by the third temperature sensor; if the pressure difference is true... If the value is less than the second threshold, the marked data is invalid. The controller determines whether C_actual is greater than or equal to the third threshold (e.g., 100 ug / m). 3 If the condition is true, the controller will control the range hood's ventilation, specifically adjusting the airflow level based on the actual C_. If the actual C_ < C1 (e.g., 200ug / m³), the controller will adjust the airflow level accordingly. 3 If C1 ≤ C_actual < C2 (e.g., 800ug / m³), then the exhaust fan is controlled to run at a low speed; 3If C_actual is greater than or equal to C2, then the exhaust fan is controlled to run at medium speed; if C_actual is less than the third threshold, then the C_actual data is stored.

[0091] It should be noted that the steps shown in the above process or in the flowchart of the accompanying figures can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A smart range hood, comprising a housing and an exhaust fan, characterized in that, The range hood also includes: A sampling air duct is vertically installed on the inner side of the box. The bottom of the sampling air duct is provided with an air inlet, a heating module and a first temperature sensor, the middle is provided with an air detection module, and the top is provided with an air outlet and a second temperature sensor. The controller is connected to the heating module, the air detection module, and the exhaust fan. It is used to control the heating module to heat up, and when the temperature difference between the first temperature detected by the first temperature sensor and the ambient temperature detected by the second temperature sensor is greater than or equal to a first threshold, it controls the air detection module to start working, and controls the exhaust fan to operate at the corresponding speed based on the concentration value detected by the air detection module.

2. The range hood according to claim 1, characterized in that, The sampling duct is equipped with micro differential pressure sensors at both the upper and lower ends of the duct wall. The micro differential pressure sensors are used to detect the pressure difference between the upper and lower ends of the sampling duct. The controller is also used to control the exhaust fan to operate at the corresponding speed based on the concentration value when the pressure difference between the two ends of the air duct is greater than or equal to the second threshold.

3. The range hood according to claim 1, characterized in that, The air detection module is equipped with a third temperature sensor; The controller is also used to compensate the concentration value detected by the air detection module based on the second temperature detected by the third temperature sensor, and to control the exhaust fan to operate at the corresponding speed based on the compensated concentration value.

4. The range hood according to claim 1, characterized in that, The inner wall of the sampling duct is provided with a sampling hole, and the probe of the air detection module extends into the interior of the sampling duct through the sampling hole.

5. The range hood according to claim 1, characterized in that, The outer side of the air inlet is equipped with a honeycomb protective net.

6. The range hood according to claim 1, characterized in that, A cone-shaped diffuser is provided on the outside of the air outlet.

7. The range hood according to claim 1, characterized in that, The inner wall of the sampling air duct is coated with a nano-oleophobic coating.

8. A control method for an intelligent range hood, characterized in that, The method, applied to the range hood according to any one of claims 1 to 7, comprises: When the range hood is in standby or low-speed operation, the heating module is controlled to heat up; Determine whether the temperature difference between the first temperature detected by the first temperature sensor and the ambient temperature detected by the second temperature sensor is greater than or equal to a first threshold. If so, control the air detection module to start working. Based on the concentration value detected by the air detection module, the exhaust fan is controlled to operate at the corresponding speed.

9. The method according to claim 8, characterized in that, The exhaust fan has low-speed, medium-speed, and high-speed settings. The settings for controlling the operation of the exhaust fan based on the concentration value detected by the air detection module include: If the concentration value is less than the first preset value, the exhaust fan is controlled to run at a low speed. If the concentration value is greater than or equal to the first preset value and less than the second preset value, then the exhaust fan is controlled to operate at medium speed. If the concentration value is greater than or equal to the second preset value, the exhaust fan is controlled to operate at high speed.

10. The method according to claim 8, characterized in that, The air detection module is equipped with a third temperature sensor, and the control of the exhaust fan operation at corresponding speeds based on the concentration value detected by the air detection module includes: The concentration value detected by the air detection module is compensated based on the second temperature detected by the third temperature sensor, and the exhaust fan is controlled to operate at the corresponding speed based on the compensated concentration value.

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