Range hood oil net, range hood and control method of range hood

Abstract

The invention relates to the technical field of digital household appliances, in particular to a range hood oil net, a range hood and a control method of the range hood. The range hood oil screen comprises an oil screen body; the shape memory material is attached to or embedded in the oil screen body; and the circuit system is electrically connected with the shape memory material and used for receiving an external driving signal and driving the shape memory material to stretch or contract so as to adjust the effective ventilation area of the air inlet. The shape memory material is integrated on the oil screen body, and the circuit system is used for receiving an external driving signal, so that the oil screen of the range hood can actively stretch or contract, the effective ventilation area of the air inlet is dynamically adjusted, and the range hood can adaptively adjust the air volume and static pressure according to real-time working conditions; the dynamic balance of air volume and static pressure is realized on the premise of ensuring the oil smoke removal efficiency, the comprehensive performance and the intelligent level of the range hood are remarkably improved, meanwhile, the structure is simple, the response is quick, mechanical noise is avoided during operation, and the user experience is improved.

Description

Technical Field

[0001] This invention relates to the field of digital home appliance technology, and in particular to a range hood oil filter, a range hood, and a control method thereof. Background Technology

[0002] As a core piece of kitchen equipment, the performance indicators of a range hood mainly include air volume, static pressure, and grease separation rate. Air volume determines the smoke extraction speed, static pressure reflects the ability to overcome the resistance of the shared flue, and grease separation rate measures the machine's efficiency in collecting grease particles from the smoke.

[0003] Currently, mainstream range hoods typically adjust performance using mechanical speed settings or automatic cruise control. Mechanical speed settings rely on manual selection of the motor speed, failing to respond in real-time to dynamic changes in oil fume concentration and duct resistance during cooking, often resulting in issues like "high noise at high speeds and ineffective fume extraction at low speeds." While automatic cruise control can sense duct resistance and automatically increase motor speed, its adjustment method is simplistic, relying solely on a passive motor response without optimizing the airflow inlet. When duct resistance increases, simply increasing the motor speed leads to a sharp rise in energy consumption and noise.

[0004] Furthermore, the air inlet of existing range hoods is usually a fixed structure, and its oil filter only serves to filter grease, without being able to actively adjust the air inlet area. This fixed structure makes it difficult to simultaneously meet the needs of high air volume (requiring large openings and low flow resistance) and high static pressure (requiring small air inlets and high negative pressure), making it difficult for the whole machine to always operate at its optimal performance point under complex and changing user conditions. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a range hood oil filter, a range hood, and a control method thereof.

[0006] In a first aspect, embodiments of the present invention provide a range hood oil filter, which is disposed at the air inlet of the range hood; the range hood oil filter includes: Oil net body; Shape memory material is attached to or embedded in the oil mesh body; The circuit system, electrically connected to the shape memory material, is used to receive external driving signals and drive the shape memory material to expand or contract in order to adjust the effective ventilation area of ​​the air inlet.

[0007] In conjunction with the first aspect, the circuit system has an input terminal and an output terminal; The input terminal is connected to an external control module to receive external drive signals; The output terminal is electrically connected to the shape memory material and is used to transmit external driving signals to the shape memory material to drive the shape memory material to stretch or expand.

[0008] In conjunction with the first aspect, shape memory materials are shape memory alloys or shape memory polymers.

[0009] Secondly, this application also provides a range hood, including a duct assembly having an air inlet, and further comprising: As mentioned above, the oil filter for range hoods is installed at the air inlet; The sensing module is used to collect the operating parameters of the range hood in real time; The control module is electrically connected to the circuit systems of the sensing module and the range hood oil filter, respectively. It is used to output drive signals to the range hood oil filter according to the operating condition parameters to drive the deformation of the range hood oil filter.

[0010] In conjunction with the second aspect, the operating parameters include at least one of the following: oil fume concentration, air volume, and static pressure.

[0011] Thirdly, this application provides a method for controlling a range hood, the method being applied to a control module in the range hood as described above; the method includes: Obtain the oil fume concentration value; Based on the comparison relationship between the oil fume concentration value and multiple preset thresholds, a target driving signal is generated; The circuit system that inputs the target drive signal into the oil filter of the range hood drives the oil filter to deform, thereby adjusting the effective ventilation area of ​​the air inlet.

[0012] In conjunction with the third aspect, the step of generating a target driving signal based on the comparison relationship between the oil fume concentration value and multiple preset thresholds includes: like A first target driving signal is generated, which is used to drive the shape memory material to shrink in order to increase the effective ventilation area of ​​the air inlet. like A second target driving signal is generated, which is used to drive the shape memory material to stretch in order to reduce the effective ventilation area of ​​the air inlet; like A third target driving signal is generated. The third target driving signal is a pulse signal, which is used to drive the shape memory material to reciprocate to expand and contract, so as to make the oil mesh of the range hood vibrate. in, For oil fume concentration value, For the first preset threshold, The second preset threshold, and .

[0013] In conjunction with the third aspect, after the step of generating the first target driving signal, the method further includes: After the first target drive signal is generated, the static pressure value is acquired in real time; If the static pressure value is lower than the preset static pressure threshold, the current intensity of the first target drive signal is adjusted to regulate the shrinkage of the shape memory material, so that the static pressure value is maintained within the preset static pressure range.

[0014] In conjunction with the third aspect, after the step of generating the second target driving signal, the method further includes: After generating the second target drive signal, the air volume value is acquired in real time; If the air volume value is lower than the preset air volume threshold, the current intensity of the second target drive signal is adjusted to fine-tune the stretching degree of the shape memory material so that the air volume value is maintained above the preset air volume threshold.

[0015] In conjunction with the third aspect, the operating parameters also include airflow and static pressure; the steps for generating the target drive signal include: The current fume removal efficiency is calculated based on the real-time air volume and static pressure. Under the premise that the oil fume removal efficiency is greater than or equal to the efficiency threshold, the target air inlet area is determined with the goal of maximizing the fit between air volume and static pressure; where the fit is used to characterize how close the current air volume to static pressure ratio is to the preset optimal fit ratio. Based on the target air inlet area, a corresponding target drive signal is generated.

[0016] The embodiments of the present invention bring the following beneficial effects: This application provides a range hood oil filter, a range hood and a control method thereof. The range hood oil filter is disposed at the air inlet of the range hood. The range hood oil filter includes: an oil filter body; a shape memory material attached to or embedded on the oil filter body; and a circuit system electrically connected to the shape memory material for receiving external driving signals and driving the shape memory material to expand or contract in order to adjust the effective ventilation area of ​​the air inlet.

[0017] This application integrates shape memory material into the oil filter body and receives external drive signals through a circuit system, enabling the oil filter of the range hood to actively expand or contract, thereby dynamically adjusting the effective ventilation area of ​​the air inlet. This allows the range hood to adaptively adjust the air volume and static pressure according to real-time operating conditions, achieving a dynamic balance between air volume and static pressure while ensuring oil fume removal efficiency. This significantly improves the overall performance and intelligence level of the range hood, while also being simple in structure, responsive, and operating without mechanical noise, thus improving the user experience.

[0018] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram showing the connection between the range hood oil filter and the control module in the first state, as provided in an embodiment of the present invention. Figure 2 This is a schematic diagram showing the connection between the range hood oil filter and the control module in the second state, as provided in an embodiment of the present invention. Figure 3 This is a schematic diagram showing the connection between the range hood oil filter and the control module in the third state, as provided in an embodiment of the present invention. Figure 4 This is a schematic diagram showing the connection between the range hood oil filter and the control module in the fourth state, as provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the signal flow during the control process of the range hood oil provided in an embodiment of the present invention; Figure 6 This is a flowchart illustrating the method for controlling the oil in a range hood according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the electronic device structure provided in an embodiment of the present invention.

[0022] Figure label: 1-Oil mesh body, 2-Shape memory material, 3-Control module, 4-Sensing module; 130 - Processor, 131 - Memory, 132 - Bus, 133 - Communication interface. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] To facilitate understanding of this embodiment, the technical terms used in this application will be briefly introduced below.

[0025] Shape memory materials: These are smart materials that exhibit shape memory effects, including shape memory alloys and shape memory polymers. These materials can undergo reversible stretching or contraction deformation under external stimuli such as temperature changes or the passage of electric current, and can return to their initial shape when the stimuli disappear.

[0026] Effective ventilation area: refers to the actual area available for airflow at the air inlet of the range hood. When the oil filter body deforms, the opening of the mesh or the overall structure changes, causing the actual ventilation area to increase or decrease accordingly, thus affecting the speed and flow rate of the incoming airflow.

[0027] Fit: This value characterizes how close the current airflow to static pressure ratio is to the preset optimal fit ratio. The fit value ranges from 0 to 1. The closer the value is to 1, the better the match between airflow and static pressure, and the closer the range hood's operating state is to its optimal condition.

[0028] Oil fume removal efficiency: a core indicator for measuring the purification capacity of a range hood, defined as the percentage reduction in oil fume concentration before and after the range hood is turned on. In this application, oil fume removal efficiency is the highest priority constraint, and all adjustments to control parameters must ensure that it is not lower than a preset threshold (e.g., 90%).

[0029] After introducing the technical terms used in this application, the application scenarios and design concepts of the embodiments of this application will be briefly described below.

[0030] Existing range hoods have fixed oil filters that only serve a filtering function and cannot adjust the air inlet area. Fixed air inlets cannot simultaneously meet the needs of high air volume (requiring a large opening) and high static pressure (requiring a small air inlet), resulting in an imbalance between air volume and static pressure, which affects the smoke extraction effect.

[0031] Based on this, this application provides a range hood oil filter, a range hood, and a control method thereof.

[0032] Example 1 This application provides a range hood oil filter, disposed at the air inlet of the range hood. Combined with... Figure 1 As shown, the range hood oil filter includes: an oil filter body 1, a shape memory material 2, and a circuit system.

[0033] Shape memory material 2 is attached to or embedded in the oil mesh body 1.

[0034] The circuit system is electrically connected to the shape memory material 2 and is used to receive external driving signals and drive the shape memory material 2 to expand or contract in order to adjust the effective ventilation area of ​​the air inlet.

[0035] This application integrates shape memory material 2 into the oil mesh body 1 and uses a circuit system to respond to external driving signals, enabling the range hood oil mesh to have the ability to actively deform. This allows the range hood with the oil mesh installed to dynamically adjust the effective ventilation area of ​​the air inlet according to the real-time operating conditions, thereby achieving an optimized balance between air volume, static pressure and oil fume removal efficiency, significantly improving the intelligence level of the range hood and the user experience.

[0036] In this embodiment, the oil mesh body 1 serves as the basic support structure for the range hood's oil mesh. It is typically made of metal materials (such as stainless steel or galvanized steel sheet) or high-temperature resistant plastics, and has multiple evenly distributed mesh holes to intercept large particles of grease in the fumes while allowing airflow. The shape of the oil mesh body 1 matches the shape of the range hood's air inlet to ensure sealing and smooth airflow after installation.

[0037] Shape memory material 2 is attached to or embedded in the oil mesh body 1. As a smart material, shape memory material 2 (such as shape memory alloy or shape memory polymer) has the characteristic of reversible deformation under external stimuli (such as temperature changes or current flow). In this embodiment, the shape memory material is processed into filaments, sheets, or mesh structures and fixed to the surface or interior of the oil mesh body 1 by welding, embedding, or weaving. When it receives a driving signal (current in this embodiment) and heats up to above its phase transition temperature, it contracts and deforms, thereby pulling the oil mesh body 1 to deform locally or entirely, increasing the mesh opening or the effective ventilation area of ​​the air inlet; when the driving signal weakens or stops, and the shape memory material 2 cools down to below the phase transition temperature, it expands by relying on its own two-way memory effect or with the help of external bias elements (such as springs, elastic substrates, or the elastic restoring force of the oil mesh body 1 itself), so that the oil mesh body 1 returns to its initial shape, and the air inlet area decreases accordingly. Through the above method, the dynamic reversible adjustment of the air inlet area is achieved.

[0038] In this embodiment, the shape memory material 2 is preferably a nickel-titanium shape memory alloy (Ni-Ti SMA), and its phase transformation temperature (austenite phase transformation end temperature Af) is set to 70℃-90℃ to adapt to the ambient temperature range during the operation of the range hood. This material is processed into fine filaments with a diameter of 0.2mm-0.5mm and embedded into the mesh edge of the oil mesh body 1 through a weaving method, with one filament spaced every 3mm-5mm to form a uniform driving network.

[0039] The circuit system (not shown in the figure) is electrically connected to the shape memory material 2 and is used to receive external driving signals and drive the shape memory material 2 to contract or expand.

[0040] In conjunction with the first aspect, the circuit system has an input terminal and an output terminal; the input terminal is connected to the external control module 3 for receiving external driving signals; the output terminal is electrically connected to the shape memory material 2 for transmitting external driving signals to the shape memory material 2 to drive the shape memory material 2 to stretch or expand.

[0041] Specifically, the circuit system includes an input terminal and an output terminal: the input terminal is connected to the control module 3 of the range hood to receive current or voltage signals from the control module 3; the output terminal is electrically connected to the shape memory material 2 to transmit the drive signal to the shape memory material 2. By adjusting the current intensity, direction, or pulse frequency of the drive signal, the deformation amount, deformation speed, and deformation mode (such as continuous contraction, continuous expansion, or reciprocating vibration) of the shape memory material 2 can be precisely controlled, thereby achieving linear adjustment or mode switching of the effective ventilation area of ​​the air inlet.

[0042] In conjunction with the first aspect, shape memory material 2 is a shape memory alloy or a shape memory polymer.

[0043] In a preferred embodiment, the shape memory material 2 is a shape memory alloy. Shape memory alloys (such as nickel-titanium alloys, copper-based alloys, etc.) are metallic materials that achieve shape memory effects through thermoelastic martensitic phase transformation. In this application, the shape memory alloy is typically processed into fine wires, sheets, or spring-like structures, and attached or embedded in the oil mesh body 1. When the circuit system applies current to the shape memory alloy, the current generates Joule heating through the material's internal resistance, raising the material temperature above the phase transformation temperature, thereby triggering the transformation from martensitic to austenitic phase, accompanied by macroscopic contraction or expansion deformation. When the current stops or decreases, the material temperature decreases, restoring to the initial phase and initial shape. By controlling the on / off state, magnitude, or direction of the current, precise control of the deformation amount, deformation speed, and deformation mode can be achieved. Shape memory alloys have advantages such as fast response speed, large driving force, and long fatigue life, making them suitable for applications requiring frequent operation or large deformation.

[0044] In another preferred embodiment, the shape memory material 2 is a shape memory polymer. A shape memory polymer is a polymeric material whose shape memory effect is typically achieved based on changes in glass transition temperature or melt transition temperature. In this application, the shape memory polymer can be fabricated into a thin film, fiber, or mesh structure, and bonded to the oil mesh body 1. When current is applied to the circuit system, the polymer temperature can be raised above the glass transition temperature through the built-in conductive layer or an external heat source. The material modulus decreases, and deformation occurs under external force or internal stress. When the temperature drops below the glass transition temperature, the material modulus recovers, and the shape is fixed. Compared to shape memory alloys, shape memory polymers have advantages such as low density, large deformation, high recovery rate, and good processing performance. Furthermore, different transition temperatures can be achieved by adjusting the material formulation to adapt to different application environments.

[0045] Understandably, regardless of whether shape memory alloys or shape memory polymers are used, their core function lies in responding to the drive signal output by the circuit system to generate controllable stretching or contraction deformation, thereby driving the oil mesh body 1 to change the effective ventilation area of ​​the air inlet. In practical applications, appropriate shape memory material types and specific models can be selected according to actual application requirements (such as response speed, driving force, cost control, and operating environment temperature), utilizing their reversible deformation characteristics to achieve dynamic adjustment of the effective ventilation area of ​​the air inlet.

[0046] Combination Figure 1 The image shows the normal state of the range hood's oil filter. At this time, the range hood is not working or is in standby mode. The oil filter body 1 maintains its initial baseline shape, the shape memory material 2 is not excited by the drive signal, and the effective ventilation area of ​​the air inlet is the preset initial value. This initial area is calibrated at the factory according to the range hood's rated operating conditions, and can provide balanced airflow and static pressure performance under normal cooking conditions. Combination Figure 2 As shown, the control module 3 outputs a first driving signal (such as a positive current) to the shape memory material 2. The shape memory material 2 shrinks when heated, causing the oil mesh body 1 to deform, increasing the mesh opening or expanding the overall structure, thus significantly increasing the effective ventilation area of ​​the air inlet. Increasing the air inlet area reduces the air intake resistance, allowing a large amount of air to quickly enter the air duct, thereby significantly increasing the air volume, achieving rapid smoke exhaust, and preventing the spread of oil fumes in the kitchen.

[0047] Combination Figure 3As shown, the control module 3 outputs a second driving signal (such as reverse current or cut-off current) to the shape memory material 2. The shape memory material 2 cools and expands, causing the oil mesh body 1 to return to its initial shape or further shrink, thus reducing the effective ventilation area of ​​the air inlet. Reducing the air inlet area increases the airflow velocity and negative pressure, thereby increasing the static pressure and enhancing the range hood's ability to resist the resistance of the common flue and prevent backflow of oil fumes, while also reducing energy consumption and operating noise.

[0048] Combination Figure 4 As shown, the control module 3 outputs a third driving signal (such as a pulsed current) to the shape memory material 2. The shape memory material 2 rapidly switches between contraction and expansion states, driving the oil mesh body 1 to generate high-frequency micro-vibrations. This vibration can, on the one hand, intercept grease particles in the fumes, preventing them from entering the duct; on the other hand, it can shake off the oil droplets already attached to the surface of the oil mesh. The shaken-off oil stains enter the oil cup along the guide groove, realizing the self-cleaning function of the oil mesh and reducing the frequency of manual cleaning.

[0049] Secondly, this application also provides a range hood, including a duct assembly having an air inlet; the range hood also includes the aforementioned range hood oil filter, sensing module 4 and control module 3.

[0050] The aforementioned oil filter for the range hood is located at the air inlet.

[0051] Sensing module 4 is used to collect the operating parameters of the range hood in real time.

[0052] The control module 3 is electrically connected to the circuit systems of the sensing module and the range hood oil screen, respectively, and is used to output drive signals to the range hood oil screen according to the operating condition parameters to drive the deformation of the range hood oil screen.

[0053] The duct assembly is the core airflow channel structure of a range hood, typically including components such as a volute, fan impeller, and drive motor. The duct assembly has an air inlet to draw in the cooking fumes generated during cooking, purify them, and then discharge them outdoors. The shape, size, and position of the air inlet directly affect the efficiency and uniformity of airflow distribution. As mentioned earlier, the grease filter is located at the air inlet. Specifically, the grease filter is installed at the air inlet of the duct assembly, covering all or part of the inlet area. When the range hood is working, the cooking fumes first pass through the grease filter into the duct. Because the grease filter has active deformation capabilities, it can adjust the effective ventilation area of ​​the air inlet by changing its shape, thereby controlling the speed, direction, and flow rate of the incoming airflow. The specific structure, material composition, and driving method of the grease filter have been detailed in the first aspect above and will not be repeated here.

[0054] The aforementioned sensing module 4 is used to collect the operating parameters of the range hood in real time. Sensing module 4 typically consists of multiple sensors and can be installed in different locations on the range hood, such as near the air inlet, inside the duct, or on the surface of the range hood casing. In this embodiment, sensing module 4 includes at least one or more of the following: a fume concentration sensor, an airflow sensor, and a static pressure sensor. The fume concentration sensor detects the concentration of oil fume particles in the cooking environment, typically using optical scattering or ionization principles; the airflow sensor detects the gas flow rate through the duct, and can employ a hot-wire anemometer, a vortex flow meter, or an indirect calculation method based on fan speed; the static pressure sensor detects the static pressure value inside the duct, typically using a piezoresistive or capacitive pressure sensor, and is installed on the side wall of the duct or inside the volute.

[0055] Combination Figure 5 As shown, the sensing module 4 transmits the collected real-time data to the control module 3 as input for subsequent control decisions. The control module 3 typically uses a microcontroller (MCU) or digital signal processor (DSP) as its core, with built-in control algorithms and drivers. The control module 3 receives real-time operating parameters from the sensing module 4, analyzes and processes these parameters to determine the characteristics of the current cooking conditions (such as the concentration of oil fumes and the resistance of the flue), and calculates the required target air inlet area based on preset control logic. Subsequently, the control module 3 generates corresponding drive signals (such as electrical signals with specific current intensity, direction, or pulse frequency), which are transmitted through the circuit system to the shape memory material, driving the range hood's oil filter to deform and adjust the effective ventilation area of ​​the air inlet.

[0056] As an feasible approach, the control module 3 and the circuit system of the range hood's grease filter can be connected via a wired connection (such as a wire or ribbon cable) or a wireless connection (such as Bluetooth or Wi-Fi), which is not limited herein. In the wired connection method, the control module 3 is typically mounted on the main control circuit board of the range hood and connected to the input terminal of the circuit system on the grease filter via a wire. In the wireless connection method, the circuit system of the grease filter needs to be equipped with a wireless receiving module, and the corresponding control module 3 needs to be equipped with a wireless transmitting module.

[0057] In conjunction with the second aspect, the operating parameters include at least one of the following: oil fume concentration, air volume, and static pressure.

[0058] Among them, oil fume concentration refers to the concentration of suspended oil fume particles in the cooking environment, usually expressed in milligrams per cubic meter (mg / m³). 3 () or number of particles per cubic centimeter (particles / cm) 3 The unit is ). Oil fume concentration is a direct indicator reflecting the intensity of cooking and the degree of oil fume pollution in the environment.

[0059] In this embodiment, the oil fume concentration sensor uses either the optical scattering principle or the ionization principle for real-time detection: the optical scattering sensor emits a laser beam to irradiate particulate matter in the airflow and calculates the particle concentration based on the intensity of the scattered light; the ionization sensor measures the change in current within the ionization chamber to reflect the particulate matter concentration. The sensing module 4 transmits the collected oil fume concentration to the control module 3 in real time. When the oil fume concentration is high, it indicates high cooking intensity and a large amount of oil fume generated, and the control module 3 can determine that it is necessary to prioritize ensuring airflow for rapid smoke removal; when the oil fume concentration is low, it indicates low cooking intensity or that the cooking is nearing its end, and it is possible to prioritize ensuring static pressure to prevent backflow or reduce energy consumption.

[0060] Air volume refers to the volumetric flow rate of gas passing through the range hood duct per unit time, usually expressed in cubic meters per minute (m³ / min). 3 The unit is ( / min). Air volume is a key indicator for measuring the smoke extraction capacity of a range hood, directly affecting the speed of smoke extraction and the efficiency of smoke removal.

[0061] In this embodiment, the airflow sensor can be implemented in several ways: one is direct measurement, such as a hot-wire anemometer or vortex flow meter, which is installed inside the duct to directly measure the airflow velocity and convert it into airflow; the other is indirect calculation, which indirectly calculates the current airflow by detecting parameters such as the fan impeller speed, current, or power, combined with the fan characteristic curve. The sensing module 4 transmits the collected real-time airflow to the control module 3. The control module 3 determines whether the current smoke extraction capacity is sufficient based on the airflow value, and, if necessary, adjusts the deformation of the range hood's oil filter to change the inlet area, thereby optimizing the airflow output.

[0062] Static pressure refers to the static pressure value inside the duct of a range hood, usually measured in Pascals (Pa). Static pressure reflects the range hood's ability to overcome the resistance of the common flue and prevent backflow of fumes. When the static pressure is high, the range hood can effectively resist external resistance and ensure smooth exhaust of fumes; when the static pressure is insufficient, poor exhaust or backflow may occur.

[0063] In this embodiment, the static pressure sensor is typically a piezoresistive or capacitive pressure sensor, installed on the side wall of the duct, inside the volute, or near the fan outlet. It outputs an electrical signal by sensing changes in gas pressure. The sensing module 4 transmits the collected real-time static pressure to the control module 3. The control module 3 determines the current flue resistance based on the static pressure value and, if necessary, adjusts the deformation of the range hood's oil filter to change the inlet area, thereby increasing the static pressure output or maintaining the static pressure within a reasonable range.

[0064] This application uses the sensing module 4 to collect at least one operating condition parameter among oil fume concentration, air volume, and static pressure in real time, providing the control module 3 with comprehensive and accurate decision-making basis. These parameters reflect the cooking environment and the operating status of the range hood from different dimensions, enabling the control module 3 to accurately determine the current operating requirements and generate corresponding drive signals to drive the range hood's oil filter to undergo adaptive deformation, ultimately achieving dynamic adjustment of the effective ventilation area of ​​the air inlet, and improving the intelligence level and overall performance of the range hood.

[0065] Combination Figure 1 The image shows the initial state of the range hood's oil filter. At this time, the range hood is in standby mode or has just been turned on, and the oil fume concentration is at a moderate to low level. The control module is not outputting drive current, or is only outputting a very small sustaining current, and the shape memory material 2 is at room temperature (martensitic phase).

[0066] In situations requiring rapid smoke extraction, a PWM signal with a large positive continuous current (e.g., 2A-5A) or a high duty cycle (>80%) is used. For example... Figure 2 As shown, the current causes the shape memory material 2 (nickel-titanium alloy wire) to rapidly heat up to above the phase transition temperature (Af=70℃-90℃) due to Joule heating, causing the material to shrink and deform. The shrinkage force overcomes the elastic force of the bias spring (or according to the high-temperature shape of the two-way memory), pulling the oil mesh body 1 towards the center of the air inlet, increasing the mesh opening and significantly increasing the effective ventilation area of ​​the air inlet, realizing the fast exhaust mode, increasing the air volume, and quickly exhausting the high-concentration oil fumes.

[0067] In situations requiring prevention of backflow and improvement of static pressure (such as when the oil fume concentration is below a threshold), the drive signal stops outputting or outputs a small reverse current to assist cooling. For example... Figure 3 As shown, the shape memory material 2 is naturally cooled (or forced to be air-cooled) to below the phase transition temperature, and the material expands (relying on its own two-way memory effect or with the help of the restoring force of the external bias element). The oil mesh body 1 expands outward, the mesh size decreases, the effective ventilation area of ​​the air inlet is reduced, the static pressure is increased, and a clean exhaust mode is achieved, which effectively prevents backflow of oil fumes in the public flue.

[0068] When the concentration of cooking fumes is at a moderate level (between the two thresholds), the driving signal is a high-frequency pulsed current (e.g., 20Hz frequency, 30% duty cycle). Figure 4 As shown, the shape memory material 2 is rapidly and repeatedly heated and cooled, generating high-frequency micro-vibrations. The oil mesh body 1 reciprocates between contraction and expansion, and the mesh openings dynamically change. This interception mode, on the one hand, increases the collision probability of oil fume particles through dynamic mesh openings, actively intercepting oil fumes; on the other hand, it uses vibration to shake off oil droplets attached to the surface of the oil mesh, achieving self-cleaning.

[0069] Thirdly, this application also provides a method for controlling a range hood, which is applied to the control module of the range hood as described above. Combined with... Figure 6 As shown, the method includes: S110, obtain the oil fume concentration value.

[0070] S120 generates a target driving signal based on the comparison relationship between the oil fume concentration value and multiple preset thresholds.

[0071] S130 inputs the target drive signal to the circuit system in the range hood oil filter, driving the range hood oil filter to deform in order to adjust the effective ventilation area of ​​the air inlet.

[0072] In step S110, control module 3 acquires the real-time oil fume concentration value in the current cooking environment through the oil fume concentration sensor in sensing module 4. The oil fume concentration sensor is typically installed near the air inlet of the range hood or inside the fume hood to ensure accurate collection of oil fume gas samples before they enter the range hood. The oil fume concentration sensor continuously collects data at a preset sampling frequency (e.g., once per second or once per hundred milliseconds) and transmits analog or digital signals to control module 3. Control module 3 filters, amplifies, and performs analog-to-digital conversion on the received raw signal to obtain the oil fume concentration value that can be used for subsequent judgment, typically expressed in milligrams per cubic meter (mg / m³). 3 () or number of particles per cubic centimeter (particles / cm) 3 (in units of )

[0073] In step S120, the preset thresholds include a first preset threshold and a second preset threshold, wherein the first preset threshold is greater than the second preset threshold, so as to divide the oil fume concentration into three ranges: high concentration range, medium concentration range, and low concentration range. In this step, the control module 3 compares the real-time oil fume concentration value obtained in step S110 with multiple preset thresholds pre-stored in the memory, determines the type of the current cooking condition based on the comparison result, and generates a corresponding target drive signal accordingly.

[0074] It should be noted that the specific values ​​of the first and second preset thresholds can be calibrated based on factors such as the model, power, and applicable kitchen area of ​​the range hood, and are usually obtained through experiments. For example, in this embodiment, the first preset threshold can be set to 2.0 mg / m³. 3 The second preset threshold can be set to 0.5 mg / m³. 3 In practical applications, the threshold can be adjusted according to actual needs. This is just an example and is not a limitation.

[0075] Subsequently, control module 3 outputs the target drive signal generated in step S120 to the circuit system of the range hood oil filter through the electrical connection line. The input end of the circuit system receives the drive signal, transmits it to the output end through the internal circuit, and finally acts on the shape memory material 2 electrically connected to the output end. The shape memory material 2 responds to the current intensity, direction, or pulse characteristics of the drive signal, and produces corresponding stretching or contraction deformation, thereby driving the oil filter body 1 to change its shape, thereby adjusting the effective ventilation area of ​​the air inlet.

[0076] In conjunction with the first aspect, step S120 includes: S121, if A first target driving signal is generated, which is used to drive the shape memory material to shrink in order to increase the effective ventilation area of ​​the air inlet.

[0077] S122, if A second target driving signal is generated, which is used to drive the shape memory material to stretch in order to reduce the effective ventilation area of ​​the air inlet.

[0078] S123, if A third target driving signal is generated. The third target driving signal is a pulse signal, which is used to drive the shape memory material to reciprocate to stretch and contract, so as to make the oil mesh of the range hood vibrate.

[0079] in, For oil fume concentration value, For the first preset threshold, The second preset threshold, and .

[0080] In step S121, if This indicates that the current cooking intensity is high and the amount of oil fumes generated is high, belonging to a high-concentration operating condition. At this time, the control module 3 generates a first target drive signal. The first target drive signal is used to drive the shape memory material 2 to contract (e.g., Figure 2 As shown in the diagram, this increases the effective ventilation area of ​​the air inlet. Increasing the air inlet area reduces air intake resistance, allowing more air to enter the duct quickly, thereby increasing airflow, achieving rapid smoke extraction, and preventing the spread of oil fumes.

[0081] The first target driving signal is usually a positive DC current, the intensity of which is linearly related to the target deformation. The control module 3 calculates the required current value according to the preset mapping relationship and outputs it to the shape memory material 2 through the circuit system. When the first target driving signal (positive DC current) is input, the shape memory material 2 (such as a shape memory alloy) experiences a temperature increase due to the Joule heating effect, undergoes a phase change and shrinks, pulling the oil mesh body 1 to increase the mesh opening or expand the overall structure, thereby increasing the effective ventilation area of ​​the air inlet.

[0082] In step S122, if This indicates that cooking is nearing completion or the system is in standby mode, with low levels of oil fumes, representing a low-concentration operating condition. At this time, control module 3 generates a second target drive signal. The second target drive signal is used to drive the shape memory material 2 to expand (e.g., Figure 3 As shown, the effective ventilation area of ​​the air inlet is reduced. Reducing the air inlet area can increase the airflow velocity and negative pressure, thereby increasing the static pressure, enhancing the range hood's ability to resist the resistance of the common flue, and preventing backflow of fumes, while reducing energy consumption and noise. The second target drive signal can be a reverse DC current or zero current (using ambient temperature cooling to allow the material to naturally recover). The control module 3 determines the current parameters based on the required reduction. When the second target drive signal (reverse DC current or zero current) is input, the shape memory material 2 cools down, recovers to its initial phase and stretches, the oil mesh body 1 resets, and the effective ventilation area of ​​the air inlet decreases.

[0083] In step S123, if This indicates that the cooking intensity is moderate, and the amount of oil fume produced is moderate, belonging to a medium-concentration operating condition. At this time, the control module 3 generates a third target drive signal. The third target drive signal is a pulse signal, used to drive the shape memory material 2 to reciprocate expansion and contraction, causing the range hood's oil mesh to generate high-frequency micro-vibrations, such as... Figure 4 As shown. This vibration can, on the one hand, intercept grease particles in the fumes, preventing them from entering the duct; on the other hand, it can shake off oil droplets already attached to the surface of the oil filter. The shaken-off grease enters the oil cup along the guide channel, realizing the self-cleaning function of the oil filter. The pulse frequency, duty cycle, and amplitude of the third target drive signal can be preset according to actual needs or dynamically adjusted during operation. When the third target drive signal (pulse current) is input, the shape memory material 2 quickly switches between contraction and expansion states, driving the oil filter body 1 to generate high-frequency micro-vibration, realizing the interception and self-cleaning functions.

[0084] In conjunction with the first aspect, after generating the first target driving signal in step S121, the method further includes: S1211, real-time acquisition of static pressure value.

[0085] Control module 3 acquires the static pressure value inside the range hood duct in real time through the static pressure sensor in sensing module 4. The static pressure sensor, typically a piezoresistive or capacitive pressure sensor, is installed on the duct sidewall, inside the volute, or near the fan outlet, and can accurately detect changes in gas pressure. The sensor continuously collects data at a preset sampling frequency (e.g., once every 100 milliseconds) and converts the real-time static pressure value into an electrical signal, which is then transmitted to control module 3. Control module 3 filters, amplifies, and performs analog-to-digital conversion on the received signal to obtain a static pressure value that can be used for judgment, usually expressed in Pascals (Pa).

[0086] S1212, If the static pressure value is lower than the preset static pressure threshold, adjust the current intensity of the first target drive signal to adjust the shrinkage degree of the shape memory material so that the static pressure value is maintained within the preset static pressure range.

[0087] In this step, control module 3 compares the real-time static pressure value obtained in step S1211 with a preset static pressure threshold. The preset static pressure threshold can be pre-calibrated based on the range hood model, the resistance characteristics of the common flue, and user habits. It can be a lower limit threshold (e.g., 150 Pa) or a preset static pressure range including both an upper and lower limit (e.g., 150 Pa to 200 Pa). When control module 3 determines that the current static pressure value is lower than the preset static pressure threshold (or lower than the lower limit of the preset static pressure range), it indicates that the air inlet area may be too large, resulting in low air intake resistance, insufficient negative pressure inside the duct, and a drop in static pressure, which may lead to poor smoke exhaust or backflow of fumes.

[0088] At this time, control module 3 dynamically adjusts the current intensity of the first target drive signal being output based on the static pressure deviation. Specifically, control module 3 reduces the Joule heating effect of shape memory material 2 by decreasing the intensity of the output current. As previously stated, the degree of shrinkage of shape memory material 2 (such as shape memory alloy) is positively correlated with the intensity of the current: the greater the current, the higher the material temperature, and the more intense the shrinkage; the smaller the current, the lower the material temperature, and the smaller the shrinkage. Therefore, by reducing the current, the shrinkage of shape memory material 2 is weakened, causing the oil mesh body 1 to slightly recover to its initial state, and the effective ventilation area of ​​the air inlet is appropriately reduced. As the air inlet area decreases, the airflow velocity increases, the negative pressure inside the air duct increases, and the static pressure value gradually rises.

[0089] As an feasible approach, control module 3 can employ a proportional-integral-derivative (PID) control algorithm or a lookup table method to calculate the required current adjustment based on the static pressure deviation and adjust the output current in real time until the static pressure value rises above the preset static pressure threshold or enters the preset static pressure range. During this process, control module 3 continuously monitors changes in the static pressure value, forming a closed-loop feedback control of detection-comparison-adjustment-re-detection. This ensures that the static pressure remains within a reasonable range, making the adjustment process continuous and smooth, and avoiding airflow fluctuations or noise caused by sudden changes.

[0090] It should be noted that the current intensity adjustment is performed under the premise that the oil fume removal efficiency is not less than 90%. If the oil fume removal efficiency drops to the critical value during the adjustment process, control module 3 will prioritize efficiency and may take other compensatory measures (such as appropriately increasing the fan speed or extending the adjustment time) to maintain overall performance balance. In addition, the preset static pressure threshold and adjustment parameters can be adaptively calibrated according to different models and operating environments to further improve the robustness of the system.

[0091] In conjunction with the third aspect, after step S122, which generates the second target driving signal, the method further includes: S1221, real-time airflow value acquisition.

[0092] In this step, control module 3 acquires the real-time gas flow rate through the range hood duct via the airflow sensor in sensing module 4. The airflow sensor continuously collects data at a preset sampling frequency (e.g., once every 100 milliseconds) and converts the real-time airflow value into an electrical signal, which is then transmitted to control module 3. Control module 3 filters, amplifies, and performs analog-to-digital conversion on the received signal to obtain an airflow value that can be used for judgment, typically expressed in cubic meters per minute (m³ / min). 3 The unit is ( / min).

[0093] S1222 If the air volume value is lower than the preset air volume threshold, adjust the current intensity of the second target drive signal to fine-tune the stretching degree of the shape memory material so that the air volume value is maintained above the preset air volume threshold.

[0094] In this step, control module 3 compares the real-time airflow value obtained in step S1221 with a preset airflow threshold. The preset airflow threshold can be pre-calibrated according to the range hood model, rated airflow, and minimum smoke extraction capacity requirements; for example, it can be set to 5m³ / h. 3 / min or 60% of the rated air volume. When the control module 3 determines that the current air volume value is lower than the preset air volume threshold, it indicates that the air inlet area may be too small, resulting in excessive air intake resistance, insufficient air intake, and reduced air volume, which may affect the basic oil fume removal efficiency.

[0095] At this point, control module 3 dynamically adjusts the current intensity of the second target drive signal being output based on the airflow deviation. As before, the second target drive signal is used to drive the shape memory material 2 to expand, thereby reducing the effective ventilation area of ​​the air inlet. The degree of expansion of the shape memory material 2 (such as a shape memory alloy) is related to the intensity of the current or the presence or absence of current: when a reverse current is applied or the current is cut off, the material temperature decreases, recovering from the contracted state to the initial expanded state; if it is necessary to control the degree of expansion at a certain intermediate position, precise adjustment can be achieved by applying a sustaining current or a pulse width modulation (PWM) signal. In this step, when it is necessary to increase the airflow, control module 3 suppresses the excessive expansion of the shape memory material 2 by appropriately increasing the current intensity (or changing the current direction), causing its contraction to increase slightly, i.e., correcting a portion of the deformation, thereby increasing the effective ventilation area of ​​the air inlet.

[0096] Specifically, assuming the second target drive signal was originally a current cutoff (zero current), allowing the shape memory material 2 to naturally cool and expand to its maximum extent, resulting in the minimum air inlet area. When the airflow is detected to be below a preset threshold, the control module 3 reapplies a positive current of a certain intensity, causing the shape memory material 2 to partially contract, and the air inlet area to appropriately increase from its minimum state. As the air inlet area increases, the air intake resistance decreases, the air intake volume increases, and the airflow value gradually recovers.

[0097] Control module 3 can employ a proportional-integral-derivative (PID) control algorithm or a lookup table method to calculate the required current adjustment based on the airflow deviation and adjust the output current in real time until the airflow value rises back above the preset airflow threshold. During this process, control module 3 continuously monitors changes in the airflow value, forming a closed-loop feedback control to ensure that the airflow is always maintained at the level required for basic smoke extraction capacity.

[0098] It should be noted that, since the amount of oil fume generated under low-concentration conditions is inherently low, appropriately increasing the air inlet area and improving the airflow will not significantly affect the oil fume removal efficiency; on the contrary, it helps to ensure the basic smoke extraction capacity. Simultaneously, during the adjustment process, the control module 3 still needs to consider changes in static pressure to avoid excessive static pressure drop due to excessive increase in the air inlet area. In the preferred embodiment, the control module 3 can simultaneously monitor both airflow and static pressure parameters, performing multi-objective coordinated adjustment to keep both within a reasonable range. Through the above-mentioned airflow feedback adjustment steps, fine-tuning of the air inlet area is achieved. This leverages the advantage of increasing static pressure with a small air inlet area in the clean exhaust mode while avoiding the drawback of insufficient airflow due to an excessively small air inlet. This allows the range hood to simultaneously balance static pressure and airflow under low-concentration conditions, ensuring basic smoke extraction capacity, preventing oil fume accumulation, and improving the overall environmental adaptability and user experience.

[0099] In conjunction with the first aspect, the operating parameters also include air volume and static pressure; step S120, which generates the target drive signal, includes: S1201 calculates the current fume removal efficiency based on the current air volume and static pressure values.

[0100] In step S1201, the control module 3 first obtains the current airflow value through the airflow sensor and static pressure sensor in the sensing module 4. and static pressure value Air volume value and static pressure value The real-time acquisition method has been described in detail in the aforementioned steps S1211 and S1221, and will not be repeated here.

[0101] Control module 3 based on the acquired air volume value and static pressure value Based on pre-stored equipment characteristic parameters, the current oil fume removal efficiency is calculated. .

[0102] Understandable, oil fume removal efficiency The percentage reduction in oil fume concentration before and after the range hood is turned on is used to measure the range hood's purification capacity. In practical applications, since real-time detection of oil fume concentration may have delays or errors, this application establishes a quantitative relationship model between oil fume removal efficiency and airflow and static pressure in advance to achieve indirect estimation and real-time monitoring of oil fume removal efficiency.

[0103] Specifically, oil fume removal efficiency It can be expressed as air volume value and static pressure value Functions:

[0104] in, To improve the efficiency of removing oil fumes, The maximum air volume For the current air volume value, For the current static pressure value, The maximum value of static pressure. For the optimal static pressure value, These are the weighting coefficients, and .

[0105] In this step, control module 3 substitutes the current airflow value... and static pressure value The current fume removal efficiency can then be calculated. Calculated The value will serve as the core constraint for subsequent optimization decisions.

[0106] S1202, under the premise that the oil fume removal efficiency is greater than or equal to the efficiency threshold, the target air inlet area is determined with the goal of maximizing the fit between air volume and static pressure; wherein, the fit is used to characterize the degree of closeness between the current air volume and static pressure ratio and the preset optimal fit ratio.

[0107] In this step, control module 3 uses the current fume removal efficiency calculated in step S1201. Based on this, an optimization objective function is established. The efficiency threshold is typically set at 90%, which is the minimum requirement to ensure the basic purification capacity of the range hood and is also the highest priority constraint in the technical solution of this application.

[0108] In satisfying Under the premise of [previous goal], control module 3 further pursues the optimal adaptability of air volume and static pressure. Adaptability is used to characterize whether the current ratio of air volume to static pressure is in the optimal operating range, because even if the oil fume removal efficiency meets the standard, if the ratio of air volume to static pressure is out of balance, it may lead to increased energy consumption, increased noise, or poor smoke exhaust.

[0109] This application defines the air volume static pressure ratio. Furthermore, a fit function is introduced to quantify the degree of fit between air volume and static pressure. This fit function can be expressed as:

[0110] in, For compatibility, To accommodate the maximum allowable fit ratio, To ensure the minimum allowable value for fit, This represents the optimal fit ratio.

[0111] Optimal fit ratio The values ​​obtained through experimental calibration indicate that the range hood operates most smoothly, consumes the least energy, and produces the least noise at this specified ratio; [ ] represents the allowable range of the adaptation ratio. Exceeding this range indicates a serious imbalance between airflow and static pressure. The adaptation value ranges from 0 to 1. The closer it is to 1, the better the adaptation between the current airflow and static pressure, and the closer the range hood's operating state is to its optimal condition.

[0112] Control module 3 meets the requirements And air volume value and static pressure value All are within the equipment's rated range ( ≤ ≤ , ≤ ≤ Given the premise that the air inlet area A maximizes the fit, find the target air inlet area A. Since the air inlet area A is related to the air volume value... and static pressure value There are definite fluid dynamic relationships between them (under the condition of a constant fan speed, the larger the inlet area A, the larger the air volume and the smaller the static pressure; the smaller the inlet area A, the smaller the air volume and the larger the static pressure). The control module 3 can use the built-in fluid model or the lookup table method to optimize the target air volume obtained by the solution. and target static pressure Converted to the corresponding target air inlet area .

[0113] In practical implementation, control module 3 can employ an iterative search algorithm to traverse possible ranges within the allowable airflow and static pressure range. , Combine different combinations and calculate the oil fume removal efficiency for each combination. And compatibility, filter out the perfect Furthermore, the combination with the highest compatibility is used to determine the corresponding target air inlet area. .

[0114] S1203 generates a corresponding target drive signal based on the target air inlet area.

[0115] In this step, control module 3 will determine the target air inlet area as specified in step S1202. This is converted into specific drive signal parameters. As mentioned before, the deformation of the range hood's oil filter (i.e., the change in the air inlet area) has a linear or non-linear relationship with the intensity, direction, or pulse characteristics of the input current. Control module 3 has a pre-stored deformation-current mapping table or fitting function, which can be used to determine the difference Δ between the target air inlet area and the current air inlet area. Calculate the required current intensity Current direction or pulse duty cycle.

[0116] For example, if the air inlet area needs to be increased, control module 3 generates a positive DC current, the current intensity of which is proportional to the required increase; if the air inlet area needs to be decreased, a reverse DC current or a cut-off current is generated; if fine-tuning is required, a small-amplitude adjustment current or PWM signal is generated. The generated target drive signal is transmitted to the shape memory material 2 through the circuit system, driving it to produce corresponding stretching or contraction deformation, so that the range hood oil mesh reaches the target shape, and the air inlet area is precisely adjusted to... .

[0117] As an example, suppose a certain range hood parameter m 3 / min, m 3 / min, Pa, Pa, Pa; weighting coefficient , , Optimal fit ratio: , , .

[0118] If the current airflow value m 3 / min, current static pressure value Pa.

[0119]

[0120] =

[0121] =70% At this point, the efficiency is 70%, which is lower than the preset efficiency threshold of 90%, violating the core constraint. Therefore, parameter adjustments are required.

[0122] First adjustment: Control module 3 attempts to increase airflow to m 3 / min (within the rated range), while maintaining static pressure With Pa constant, the efficiency constraint is met by increasing the air volume. The fume removal efficiency is then recalculated.

[0123] =

[0124] =

[0125] =86% At this point, the efficiency is 86%, which is lower than the preset efficiency threshold of 90%, violating the core constraint. Therefore, parameter adjustments are still required.

[0126] Second adjustment: Control module 3 continues to increase airflow to m 3 / min (maximum value reached), while maintaining static pressure With Pa constant, the efficiency constraint is met by increasing the air volume. The fume removal efficiency is then recalculated.

[0127]

[0128]

[0129] At this point, the fume removal efficiency meets the preset requirement of 90%.

[0130] After the oil fume removal efficiency meets the standard, the adaptability is calculated. Furthermore, the static pressure is adjusted until a parameter combination that satisfies both efficiency constraints and optimal adaptability is obtained.

[0131] Thirdly, embodiments of this application provide an electronic device, combined with Figure 7 As shown, the electronic device includes a memory 131 and a processor 130. The memory 131 stores a computer program, and the processor 130 runs the computer program to make the electronic device perform the above-described method.

[0132] Furthermore, combined Figure 7 The electronic device shown also includes a bus 132 and a communication interface 133, with the processor 130, the communication interface 133 and the memory 131 connected via the bus 132.

[0133] The memory 131 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 133 (which can be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc. The bus 132 may be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 7 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0134] Processor 130 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 130 or by instructions in software form. Processor 130 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this invention can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software module can reside in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory 131, and processor 130 reads the information in memory 131 and, in conjunction with its hardware, completes the steps of the method described in the foregoing embodiments.

[0135] Fourthly, embodiments of this application provide a readable storage medium storing computer program instructions, which are read and executed by a processor to perform the above-described method.

[0136] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0137] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0138] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0139] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0140] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A range hood oil filter, characterized in that, The range hood oil filter is located at the air inlet of the range hood; the range hood oil filter includes: Oil net body; Shape memory material is attached to or embedded in the oil mesh body; The circuit system, electrically connected to the shape memory material, is used to receive external driving signals and drive the shape memory material to expand or contract in order to adjust the effective ventilation area of ​​the air inlet.

2. The range hood oil filter according to claim 1, characterized in that, The circuit system has an input terminal and an output terminal; The input terminal is connected to an external control module and is used to receive the external drive signal; The output terminal is electrically connected to the shape memory material and is used to transmit the external driving signal to the shape memory material to drive the shape memory material to stretch or expand.

3. The range hood oil filter according to claim 2, characterized in that, The shape memory material is a shape memory alloy or a shape memory polymer.

4. A range hood, comprising a duct assembly having an air inlet, characterized in that, Also includes: The range hood oil filter as described in any one of claims 1 to 3 is disposed at the air inlet; The sensing module is used to collect the operating parameters of the range hood in real time; The control module is electrically connected to the circuit systems of the sensing module and the range hood oil filter, respectively, and is used to output a drive signal to the range hood oil filter according to the operating condition parameters to drive the deformation of the range hood oil filter.

5. The range hood according to claim 4, characterized in that, The operating parameters include at least one of the following: oil fume concentration, air volume, and static pressure.

6. A method for controlling a range hood, characterized in that, The method is applied to the control module of the range hood as described in claim 4; the method includes: Obtain the oil fume concentration value; Based on the comparison relationship between the oil fume concentration value and multiple preset thresholds, a target driving signal is generated; The target drive signal is input to the circuit system in the range hood oil filter to drive the range hood oil filter to deform, thereby adjusting the effective ventilation area of ​​the air inlet.

7. The method according to claim 6, characterized in that, The step of generating a target driving signal based on the comparison relationship between the oil fume concentration value and multiple preset thresholds includes: like A first target driving signal is generated, which is used to drive the shape memory material to shrink in order to increase the effective ventilation area of ​​the air inlet; like A second target driving signal is generated, which is used to drive the shape memory material to stretch in order to reduce the effective ventilation area of ​​the air inlet; like A third target driving signal is generated, which is a pulse signal, to drive the shape memory material to reciprocate to expand and contract, so as to make the oil mesh of the range hood vibrate. in, For oil fume concentration value, For the first preset threshold, The second preset threshold, and .

8. The method according to claim 7, characterized in that, After the step of generating the first target driving signal, the method further includes: After the first target drive signal is generated, the static pressure value is acquired in real time; If the static pressure value is lower than the preset static pressure threshold, the current intensity of the first target driving signal is adjusted to regulate the shrinkage degree of the shape memory material, so that the static pressure value is maintained within the preset static pressure range.

9. The method according to claim 7, characterized in that, After the step of generating the second target drive signal, the following steps are also included: After generating the second target drive signal, the air volume value is acquired in real time; If the air volume value is lower than the preset air volume threshold, the current intensity of the second target drive signal is adjusted to fine-tune the stretching degree of the shape memory material so that the air volume value is maintained above the preset air volume threshold.

10. The method according to claim 7, characterized in that, The operating parameters also include air volume and static pressure; The steps for generating the target drive signal include: The current fume removal efficiency is calculated based on the real-time air volume and static pressure. Provided that the oil fume removal efficiency is greater than or equal to the efficiency threshold, the target air inlet area is determined with the goal of maximizing the compatibility between air volume and static pressure; wherein, the compatibility is used to characterize the degree to which the current ratio of air volume to static pressure is close to the preset optimal compatibility ratio. Based on the target air inlet area, a corresponding target drive signal is generated.

Images