A range hood and a control method thereof

Abstract

The application relates to the technical field of smart homes, in particular to an oil fume extractor and a control method thereof, which comprises a machine body, a main fan device arranged in the machine body, a flap hinged to the machine body, and a multi-channel auxiliary air flow structure fixedly integrated on the back of the flap; the multi-channel auxiliary air flow structure cooperates with the main fan device to jointly form a dynamic flow field above a cooking appliance through auxiliary air flows with adjustable flow ratios emitted from air flow ejection channels, so as to realize the forward movement of an oil fume suction negative pressure area. The application provides an oil fume extractor, the multi-channel auxiliary air flow structure is fixedly integrated on the back of the flap, cooperates with the main fan device, jointly forms a dynamic flow field above a cooking appliance through auxiliary air flows with adjustable flow ratios emitted from air flow ejection channels, realizes the forward movement of an oil fume suction negative pressure area, and effectively restrains the dispersion of oil fume from the source, thereby improving the user experience.

Description

Technical Field

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

[0002] Range hoods are one of the core appliances in modern kitchens, and their performance directly affects the cleanliness and comfort of the cooking environment. With the development of home aesthetics, the market has placed higher demands on the appearance of range hoods, leading to the increasing popularity of fully integrated, ultra-thin, top-mounted range hoods that blend seamlessly with cabinetry. These products achieve visual simplicity and uniformity by concealing the unit within the cabinetry or employing an extremely thin design.

[0003] However, this pursuit of aesthetic form also brings significant technical challenges. To achieve an ultra-thin or fully integrated effect, the vertical distance between the range hood's air inlet and the cookware's working area is usually increased, leading to a decrease in the efficiency of the traditional single negative pressure suction mode. After being generated from the cookware, cooking fumes are easily affected by ambient airflow and naturally diffuse during their ascent, often escaping before reaching the air inlet—the so-called "smoke escape" phenomenon. This is particularly severe in cooking scenarios that generate large amounts of high-temperature fumes, such as stir-frying. To solve this problem, existing technologies mainly follow two paths: one is to use a mechanical lifting mechanism to lower the smoke-collecting chamber during operation to shorten the smoke extraction distance, but this solution introduces problems such as structural complexity, reduced reliability, increased noise, and difficulty in cleaning; the other is to simply increase the fan's airflow and static pressure, but this directly leads to a significant increase in power consumption and operating noise, affecting the user experience. Neither of these solutions fundamentally solves the problem of insufficient negative pressure zone coverage while maintaining a fixed ultra-thin structure.

[0004] Therefore, how to effectively expand and optimize the airflow field of the range hood above the cooktop without physically moving parts and without significantly increasing power consumption and noise, especially by actively "moving forward" and "sinking" the effective negative pressure zone closer to the source of cooking fumes, has become a key technical challenge that urgently needs to be overcome in this field. Summary of the Invention

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

[0006] In a first aspect, embodiments of the present invention provide a range hood, the range hood comprising: Organism; The main fan unit is installed inside the machine body; A flap, hinged to the body; A multi-channel auxiliary airflow structure is fixedly integrated into the back of the flap; The multi-channel auxiliary airflow structure works in conjunction with the main fan device to form a dynamic flow field above the stove by using auxiliary airflows with adjustable flow rates ejected from the outlets of each airflow ejection channel, thereby achieving the forward shift of the negative pressure zone for smoke extraction.

[0007] In conjunction with the first aspect, the multi-channel auxiliary airflow structure includes: An auxiliary fan, located inside the range hood, is used to provide an independent airflow source; The flow distribution device has its inlet connected to the outlet of the auxiliary fan; At least two airflow ejection channels, the inlet of each airflow ejection channel is connected to the corresponding outlet of the flow distribution device, and the outlet of each airflow ejection channel is set at the corresponding target position of the flap and faces the corresponding target direction. The flow rate ratio of the airflow to each airflow ejection channel is adjusted by regulating the flow distribution device.

[0008] In conjunction with the first aspect, the airflow ejection channel includes: The first channel has its outlet located at the lower edge of the flap, through which airflow forms a vertically downward air curtain. The second channel has an outlet located in the middle of the inner surface of the flap, and a guide surface is provided in front of its outlet. The airflow passes through to form a guide airflow that flows against the inner wall of the flap. The third channel has an outlet located above the outlet of the second channel, through which airflow forms an ejector stream.

[0009] In conjunction with the first aspect, the guide surface in front of the second channel exit is a Coanda surface.

[0010] In conjunction with the first aspect, the flow distribution device is connected to the drive device and is driven to rotate to adjust the flow rate ratio of each airflow outlet channel.

[0011] In conjunction with the first aspect, it also includes a main control unit, which is communicatively connected to the flow distribution device, auxiliary fan and main fan device in the multi-channel auxiliary airflow structure, and is used to automatically adjust the airflow ratio of each channel and the power of the main fan according to the cooking conditions.

[0012] In conjunction with the second aspect, the main control unit is connected to the oil fume concentration sensor and the temperature sensing module respectively; the oil fume concentration sensor is used to detect the oil fume concentration; the temperature sensing module is used to detect the temperature at the bottom of the cookware or inside the pot.

[0013] Secondly, this application provides a control method for a range hood, which is applied to the aforementioned range hood; the method includes: Obtain the current cooking parameters, including oil fume parameters, pot bottom temperature, and pot bottom temperature rise parameters; Based on the current cooking parameters, determine the target operating mode of the range hood; the target operating mode is associated with the preset power level of the main fan and the flow distribution ratio of each airflow channel in the multi-channel auxiliary airflow structure; Based on the target operating mode, control the range hood to operate in accordance with the target operating mode.

[0014] In conjunction with the second aspect, the steps for determining the target operating mode of the range hood based on the current cooking parameters include: Determine whether the real-time oil fume concentration is greater than the preset concentration threshold; If so, the target operating mode is determined to be the emergency enhancement mode; in the emergency enhancement mode, the flow rate of the first channel in the multi-channel auxiliary airflow structure reaches the upper limit value, while the flow rate of the third channel reaches the lower limit value.

[0015] In conjunction with the second aspect, after determining whether the real-time oil fume concentration exceeds the preset concentration threshold, the following steps are also included: If not, the target operating mode is determined based on the comparison between the bottom temperature of the pot and multiple preset temperature thresholds, and / or the comparison between the bottom temperature rise parameter and multiple preset temperature rise thresholds.

[0016] The embodiments of the present invention bring the following beneficial effects: This application provides a range hood and its control method. The range hood includes: a body; a main fan device disposed in the body; a flap hinged to the body; and a multi-channel auxiliary airflow structure fixedly integrated into the back of the flap. The multi-channel auxiliary airflow structure works in conjunction with the main fan device to form a dynamic flow field above the stove by means of auxiliary airflows with adjustable flow ratios ejected from the outlets of each airflow ejection channel, thereby realizing the forward movement of the smoke extraction negative pressure zone.

[0017] This application provides a range hood that uses a multi-channel auxiliary airflow structure fixed on the back of the flap to work in conjunction with the main fan. The auxiliary airflow, with adjustable flow rate, ejected from the outlets of each airflow channel, forms a dynamic flow field above the stove to move the negative pressure zone of the smoke extraction forward. This effectively curbs the spread of fumes from the source and improves 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.

[0020] 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

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the external structure of a range hood provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of a range hood provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the airflow direction of the multi-channel auxiliary airflow structure provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the negative pressure generated during the operation of a range hood in related technologies; Figure 5 This is a schematic diagram of the negative pressure generated during operation of a range hood with a multi-channel auxiliary airflow structure provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of signal transmission for a range hood provided in an embodiment of the present invention; Figure 7 A flowchart illustrating the control method for a range hood provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the electronic device structure provided in an embodiment of the present invention.

[0023] Figure label: 1-Main body, 11-Hollow cavity, 2-Flap plate, 3-Multi-channel auxiliary airflow structure, 31-Auxiliary fan, 32-Flow distribution device, 33-First channel, 34-Second channel, 35-Third channel, 4-Main fan device, 5-Main control unit, 6-Fume concentration sensor, 7-Temperature sensing module; 130 - Processor, 131 - Memory, 132 - Bus, 133 - Communication interface. Detailed Implementation

[0024] 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.

[0025] To facilitate understanding of this embodiment, the application scenarios and design concepts of this application embodiment will be briefly introduced below.

[0026] Existing range hoods have insufficient negative pressure zones to cover the cooktop, causing cooking fumes to easily escape and limiting the user experience.

[0027] Based on this, this application provides a range hood and its control method.

[0028] Example 1 This application provides a range hood, including: a body 1, a main fan device 4, a flap 2, and the aforementioned multi-channel auxiliary airflow structure 3.

[0029] The main fan unit 4 is located inside the body 1.

[0030] The flap 2 is hinged to the body 1.

[0031] The multi-channel auxiliary airflow structure 3 is fixedly integrated into the back of the flap 2; Among them, the multi-channel auxiliary airflow structure 3 works in conjunction with the main fan device 4. Through the auxiliary airflow with adjustable flow rate emitted from the outlet of each airflow ejection channel, a dynamic flow field is formed above the stove to achieve the forward movement of the smoke-absorbing negative pressure zone.

[0032] Understandably, the body 1 of the range hood, as the main support and housing of the entire range hood, is usually made of metal sheet, and forms a smoke collection chamber and air duct inside. Its structure is fixed, and there is no need to design lifting or deformation mechanisms to improve the smoke extraction effect.

[0033] The main fan unit 4, serving as the core power source for smoke extraction, is located within the internal air duct of the unit 1. Composed of a motor and a centrifugal impeller, the main fan unit 4 generates powerful main and negative pressure and exhaust power, ultimately expelling the captured fumes outdoors.

[0034] The flap 2, serving as both a user interaction and pneumatic structural carrier, is hinged to the lower front of the main body 1. Normally, it can be closed flush with the cabinet; during operation, it can be opened manually or electrically to a certain angle. A dedicated hollow cavity 11 is located at its back.

[0035] The multi-channel auxiliary airflow structure 3 is fixedly integrated into the cavity on the back of the flap 2, and opens or closes together with the flap. It includes an independent auxiliary fan 31, a three-way proportional valve, and a first channel 33 (air curtain), a second channel 34 (wall-mounted guide), and a third channel 35 (ejector). Its specific composition has been described in detail in the first aspect and will not be repeated here.

[0036] This application presents a dual-airflow synergistic system consisting of a main fan unit 4 and a multi-channel auxiliary airflow structure 3. The multi-channel auxiliary airflow structure 3, integrated on the flap 2, ejects precisely adjusted auxiliary airflow from the outlets of the first channel 33, the second channel 34, and the third channel 35 according to the control system's instructions. These airflows respectively undertake the technical tasks of air curtain sealing, wall-mounted guidance, and active ejection. By adjusting the flow ratio of the three channels in real time, this synergistic force can be dynamically adjusted to create and optimize a dynamic composite flow field above the stove, with variable position, shape, and intensity. These auxiliary airflows actively intervene in and interfere with the original flow field generated by the main fan unit 4. In particular, the wall-mounted guiding airflow of the second channel 34 can effectively push and guide the main negative pressure zone, changing its shape from a semi-circle to a more forward-protruding fan shape, significantly increasing the distance from the effective negative pressure zone to the stove (L2>L1).

[0037] In conjunction with the first aspect, a multi-channel auxiliary airflow structure 3 for a range hood is provided, which is fixedly integrated into a hollow cavity 11 on the back of the range hood's flap 2. Figure 1 As shown, the structure includes: an auxiliary fan 31, a flow distribution device 32, and an airflow ejection channel.

[0038] The auxiliary fan 31 is located inside the body 1 of the range hood and is used to provide an independent airflow source.

[0039] The flow distribution device 32 has its inlet connected to the outlet of the auxiliary fan 31.

[0040] There are at least two airflow ejection channels. The inlet of each airflow ejection channel is connected to the corresponding outlet of the flow distribution device 32. The outlet of each airflow ejection channel is set at the corresponding target position of the flap and faces the corresponding target direction.

[0041] The flow distribution device 32 is adjusted to regulate the flow rate ratio of the airflow to each airflow ejection channel.

[0042] This application utilizes a multi-channel auxiliary airflow structure 3 fixed to the back of the flip plate 2. By adjusting the flow distribution device 32, the flow of various functional airflows with independently adjustable flow can be actively and dynamically shaped and moved forward to the source area above the stove. This significantly improves the efficiency of oil fume capture without the need for a complex mechanical lifting structure, completely solves the problem of smoke leakage in ultra-thin models, and enhances the user experience.

[0043] Combination Figure 1 As shown, the range hood includes a body 1 and a hinged flap 2 at its front. The back of the flap 2 has a dedicated hollow cavity 11, within which a multi-channel auxiliary airflow structure 3 is fixedly integrated, forming a single unit with the flap 2. This allows the activation (operating when the flap 2 is open) and retraction (hidden when the flap 2 is closed) of this functional module to rely solely on the hinged movement of the flap 2 itself, eliminating the need for any separate lifting or unfolding mechanisms, resulting in a simple and reliable structure.

[0044] The auxiliary fan 31, serving as an independent airflow source, is installed inside the body 1 (not inside the flap 2), typically located near the upper cover of the smoke collection chamber. Figure 1 and Figure 2 As shown, the air inlet of the auxiliary fan 31 is connected to the outside or the smoke collection chamber. The airflow generated by it is transported through a flexible pipeline (air duct in the figure), passes through the hinge shaft area of ​​the flap 2, and finally enters the flow distribution device 32 in the hollow cavity 11 on the back of the flap 2. This arrangement decouples the power unit (in the body 1) from the execution unit (located in the flap 2), ensuring both the freedom of movement of the flap 2 and a stable supply of airflow. By adjusting the flow distribution device 32, the proportion of airflow leading to these multiple airflow outlet channels can be precisely controlled, thereby achieving dynamic proportioning and coordinated operation of various corresponding pneumatic functions.

[0045] In conjunction with the first aspect, the airflow ejection channels include: a first channel 33, a second channel 34, and a third channel 35.

[0046] Combination Figure 3 As shown, the outlet of the first channel 33 is located at the lower edge of the flap 2, and the airflow forms a vertically downward air curtain.

[0047] The outlet of the first channel 33 is a narrow slit extending along the entire lower edge of the flap 2, preferably 3-8 mm wide. The airflow exiting from this outlet descends vertically, forming a dense, continuous air curtain (or "wind curtain"). Figure 3 The airflow diagram shows that the function of this air curtain is similar to extending the flap 2 downwards invisibly. Its core function is physical sealing, which effectively blocks the path of cooking fumes to the front (i.e. towards the user) and confines the fumes within the capture space enclosed by the flap, air curtain and stove surface. It is the first active line of defense against smoke escape.

[0048] The outlet of the second channel 34 is located in the middle of the inner surface of the flap 2, and a guide surface is provided in front of its outlet. The airflow passes through to form a guide airflow that flows against the inner wall of the flap 2.

[0049] The outlet of the second channel 34 is located in the middle of the inner surface of the flap 2, and is usually an arc-shaped narrow slit. A guide surface (preferably a Coanda surface) with a specific radius of curvature is located directly in front of this outlet. After the airflow exits from this outlet, it undergoes the Coanda effect. Under the influence of the wall-attachment effect, the airflow will naturally deviate from its initial direction and closely adhere to the guide surface in front. This wall-attached airflow mainly moves diagonally downwards (towards the cookware area) along the inner wall of the flap 2. Its main functions are twofold: Firstly, the high-speed flow of clean air forms a gaseous protective film on the key surface of the flap 2, which can effectively reduce the direct contact between oil mist particles and the inner wall of the flap, thereby reducing oil adhesion and facilitating cleaning.

[0050] Secondly, the wall-mounted airflow can push and guide the main negative pressure zone generated by the main fan device 4 to extend away from the air inlet and closer to the cookware, thereby shifting the negative pressure forward and significantly shortening the effective smoke extraction distance.

[0051] Specifically, in combination Figure 4 and Figure 5 As shown, when the main fan of a traditional range hood is working, a near-semi-circular negative pressure zone forms in front of its air inlet. Within this zone, the negative pressure is strongest and the smoke capture effect is most significant only along the central axis near the air inlet; in the remaining areas on either side of this axis, the negative pressure intensity rapidly decreases with the angle, resulting in limited smoke extraction capacity, and these areas can be considered inefficient or ineffective negative pressure zones. Therefore, the key to improving smoke extraction efficiency lies in concentrating and effectively guiding and extending the limited negative pressure energy in a vertical direction closer to the cooktop (i.e., the direction of the line connecting the air inlet and the source of the smoke).

[0052] This application achieves this goal by setting a second channel (wall-attached guide channel) in a multi-channel auxiliary airflow structure and constructing a Coanda surface in front of its outlet. Figure 5 As shown, the airflow ejected from this channel flows downwards and forwards close to the inner wall of the flap under the influence of the Coanda effect. This auxiliary airflow flowing along the wall acts like an air curtain, actively intervening and compressing the semi-circular negative pressure field originally formed by the main fan, forcing its distribution pattern to change.

[0053] According to the principle of energy conservation in fluid mechanics, under the condition that the total energy of the main fan intake remains constant, this wall-attached airflow occupies part of the space on both sides of the original negative pressure zone, causing the energy of the negative pressure field to be redistributed and more concentrated in the forward target direction. As a result, the effective negative pressure zone is no longer a uniform semi-circle, but becomes a forward-protruding, extended fan shape. This change is visually manifested as: Figure 5As shown, the effective negative pressure distance L2 perpendicular to the air inlet after optimization is significantly greater than the corresponding distance L1 under the traditional scheme. This positive extension and focusing of the negative pressure zone shape forward achieves the forward shift of negative pressure in this application, thereby significantly enhancing the ability to capture oil fumes at the source without changing the structural height.

[0054] The outlet of the third channel 35 is located above the second channel 34, and the airflow passes through to form an ejector airflow.

[0055] Specifically, the outlet of the third channel 35 is located above the outlet of the second channel 34 and closer to the air inlet of the main fan unit 4 on the main body 1. The airflow from this outlet is designed to be obliquely upward, directly targeting the negative pressure core area of ​​the main fan unit 4. Its main function is to provide kinetic energy replenishment and achieve directional delivery: it applies an obliquely upward acceleration and guidance effect to the wall-guided airflow from the second channel 34, as well as the oil fume mixture already entrained by the guided airflow. This ensures that the oil fume mass maintains sufficient kinetic energy during its movement towards the main air inlet, avoiding velocity attenuation and diffusion due to the long flow path, so that it can be efficiently and centrally delivered to the air inlet of the main fan unit 4 and completely discharged, thereby effectively solving the problem of decreased suction efficiency that may be caused by the extended capture path.

[0056] The three channels described above constitute a complete and coordinated active airflow control system. Through a flow distribution device (such as a three-way proportional valve), the flow ratio of the three airflows is independently and continuously adjusted. The system can dynamically adjust the intensity ratio of the three functions—blocking, guiding, and ejecting—according to different operating conditions such as stir-frying, simmering, and finishing. For example, during stir-frying, the flow of the first and second channels is increased to strengthen blocking and guiding; under normal conditions, the flow is evenly distributed; and during finishing, the second channel is strengthened for self-cleaning. This coordinated working mode ultimately achieves the dynamic creation of a forward-moving and downward-sinking high-efficiency negative pressure zone without relying on a physical lifting structure, fundamentally improving the smoke capture performance of fixed ultra-thin range hoods.

[0057] In conjunction with the first aspect, the guide surface in front of the second channel 34 exit is a Coanda surface.

[0058] Coand surface Surface) is based on the Coanda effect (Coanda effect) The wall effect (also known as the adhesion effect) is a specific geometric surface designed based on this principle. This effect refers to the phenomenon where, when a jet of fluid (such as air) is ejected from a slit and flows over a nearby solid surface, the jet deviates from its initial direction, adhering closely to and flowing along the contour of the surface, rather than diffusing directly into free space as would normally. This phenomenon is caused by the combined effects of pressure difference and viscosity between the jet and the surface.

[0059] In this structure, a Coanda surface with a specific radius of curvature (such as...) is integrally located adjacent to and in front of the outlet of the second channel 34 (attached wall guide channel). Figure 3 , Figure 4 , Figure 5 As shown in the image).

[0060] As the airflow exits from the outlet of the second channel 34, it immediately acts on this Coanda surface. Under the influence of the Coanda effect, the airflow automatically changes direction, transforming from a state of possible free diffusion to a state of flowing obliquely downwards and closely adhering to the surface. The curvature of this surface has been aerodynamically optimized to guide the airflow into a stable, large-area wall-hugging flow with minimal energy loss.

[0061] like Figure 5 As shown, this controlled wall-mounted airflow effectively compresses and reshapes the traditional semi-circular negative pressure zone formed by the main fan in front of the air inlet. It pushes and guides more of the negative pressure field's energy away from the air inlet and towards the cookware, forming a more convex fan-shaped negative pressure distribution. This directly leads to a significant increase in the effective negative pressure action distance perpendicular to the air inlet, achieving the goal of actively lowering and moving the smoke extraction point forward to the source of oil fume generation, fundamentally solving the problem of smoke escape caused by installation height limitations. The high-speed, clean wall-mounted airflow forms a dynamic barrier on the key inner surface of the flap 2, significantly reducing the direct contact and adhesion of oil fume particles to the flap surface, thereby assisting in cleaning and reducing maintenance frequency.

[0062] In conjunction with the first aspect, the flow distribution device 32 is connected to the drive device and is driven to rotate to adjust the flow rate ratio of each airflow ejection channel.

[0063] In a preferred embodiment of this application, the device is specifically a three-way proportional control valve (e.g., Figure 3 (Illustrated). It contains a rotatable valve core, the structure of which determines how the total airflow from the inlet is distributed to the three outlets (leading to the first, second, and third channels respectively). A stepper motor is typically used as the drive. The stepper motor can receive precise digital pulse signals, thereby controlling its output shaft to rotate at a specific angle. The output shaft of the stepper motor is mechanically connected to the valve core of the three-way proportional control valve (e.g., directly connected via a coupling). When the control system issues a command, the position of the valve core can be continuously and steplessly changed by precisely controlling the rotation angle of the stepper motor. Different positions of the valve core correspond to different flow area ratios at the three outlets, thereby achieving dynamic, independent, and precise adjustment of the airflow ratio to the first channel 33 (air curtain), the second channel 34 (wall guide), and the third channel 35 (ejector). For example: Rotating the valve core to a certain angle allows most of the airflow to flow into the second channel, thereby enhancing the wall-mounted flow guidance and negative pressure forward movement.

[0064] Rotating to another angle can simultaneously increase the flow to the first and third channels, thereby enhancing the air curtain blockade and ejection efficiency.

[0065] This adjustment is continuous, rather than a simple on / off switch or a few gear shifts, thus achieving a smooth transition and optimal matching of airflow intensity.

[0066] With this ability to independently, continuously, and precisely adjust the airflow ratio of each channel, the intelligent control system at the back end (based on sensors such as oil fume concentration and pot bottom temperature) can realize its complex control algorithm and dynamically output the optimal airflow formula according to the real-time cooking conditions (such as preheating, stir-frying, and finishing), ultimately achieving an adaptive, high-efficiency, and low-energy smoke extraction effect.

[0067] In conjunction with the first aspect, it also includes a main control unit 5, which is communicatively connected to the flow distribution device 32, the auxiliary fan 31, and the main fan device 4 in the multi-channel auxiliary airflow structure 3, and is used to automatically adjust the airflow ratio of each channel and the power of the main fan according to the cooking conditions.

[0068] The range hood can also be further integrated with a main control unit 5. This main control unit 5 is communicatively connected to the main fan unit 4 and the valves and fans in the multi-channel auxiliary airflow structure 3. By receiving sensor signals such as oil fume concentration and pot bottom temperature, the main control unit 5 can automatically execute multi-mode control logic as described in the background art, making the operation of the dual airflow coordination system fully automated and intelligent, achieving the best user experience.

[0069] In conjunction with the first aspect, the main control unit 5 is connected to the oil fume concentration sensor 6 and the temperature sensing module 7 respectively; the oil fume concentration sensor 6 is used to detect the oil fume concentration; the temperature sensing module 7 is used to detect the temperature at the bottom of the cookware or inside the pot.

[0070] The oil fume concentration sensor 6, used to detect the concentration of cooking fumes, is arranged on the inner surface of the flap 2 of the range hood, typically near the air inlet or above the outlet of the second channel 34. Figure 1 , Figure 2 As shown, this location allows it to be directly exposed to the rising airflow generated during cooking, facing the undiluted fumes. The fume concentration sensor 6 generates the fume concentration from the cookware and rises to the vicinity of the flip plate in real time. It converts the physical / chemical signal of the fume concentration (e.g., through ionization, optical, or semiconductor principles) into a continuous electrical signal, serving as a direct, feedback signal reflecting the current severity of fume pollution.

[0071] The temperature sensing module 7, used to acquire cookware temperature information, is installed on the main body 1, typically positioned on the inner surface of the flap 2 or near the air inlet, so that it can be directly aligned with the cookware below. This module uses an infrared temperature sensor, enabling non-contact, real-time detection of the temperature at the bottom or inside of the cookware, obtaining accurate cookware temperature values. The temperature data is transmitted in real-time via internal wiring to the main control unit 5 of the range hood, serving as a feedforward, predictive signal reflecting the cooking process and thermal state.

[0072] Combination Figure 6 As shown, the data from these two types of sensors are fused and processed in the controller of the main control unit 5, forming the input for intelligent decision-making and driving the multi-channel auxiliary airflow structure to work in coordination with the main fan. Understandably, the generation of cooking fumes is highly temperature-dependent. By monitoring the temperature of the pot bottom and its rate of change, the system can predict the actual large-scale generation of fumes. The fume concentration sensor provides the most direct evidence of the presence of fumes, used to verify the accuracy of the feedforward judgment and to respond to emergencies. Based on precise sensor input, the system does not need to keep the main fan and auxiliary airflow at their highest power level at all times. In conditions where high-intensity fume extraction is not required (such as when simmering soup), the system can maintain low-power operation, significantly reducing noise and energy consumption; performance is only instantly boosted when needed, achieving a balance between high performance and high comfort.

[0073] Secondly, embodiments of this application provide a control method for a range hood, which is applied to the aforementioned range hood. (In conjunction with...) Figure 7 As shown, the method includes: S110, obtain the current cooking parameters, including oil fume parameters, pot bottom temperature and pot bottom temperature rise parameters.

[0074] S120 determines the target operating mode of the range hood based on the current cooking parameters; the target operating mode is associated with the preset power level of the main fan and the flow distribution ratio of each airflow channel in the multi-channel auxiliary airflow structure.

[0075] S130 controls the range hood to operate according to the target operating mode.

[0076] Step S110 acquires cooking parameters closely related to the generation of oil fumes in real time through various sensors. These parameters mainly include the oil fume concentration signal, which directly reflects the diffusion of oil fumes, and the bottom temperature of the pot and its rate of change, which serve as precursor indicators of oil fume generation. The oil fume concentration is directly measured by the oil fume concentration sensor 6 arranged inside the flap 2, providing immediate feedback on the current level of oil fume pollution; while the bottom temperature and temperature rise rate are usually provided by the temperature sensing module 7 built into the cooktop and transmitted to the main control unit 5 through a communication link. These two constitute the key feedforward signals for predicting the trend of oil fumes.

[0077] After acquiring comprehensive real-time data, step S120 determines the most suitable target operating mode based on the aforementioned cooking parameters using a built-in intelligent algorithm. Understandably, the main control unit 5 pre-stores an optimized multi-mode strategy library, including modes such as standby, pre-start, normal cooking, pre-stir-fry, high-intensity stir-fry with strong suction, emergency boost, and final cleaning. Each mode is not a simple label but is associated with a carefully set set of execution strategy parameters, specifically including the power level (e.g., low, medium, high, overclock) to be used by the main fan device 4, and the precise airflow distribution ratio between the first channel 33, the second channel 34, and the third channel 35 in the multi-channel auxiliary airflow structure 3. The decision-making logic employs a hierarchical judgment mechanism. First, it determines whether the real-time oil fume concentration exceeds a preset safety threshold. If it does, it directly enters the emergency boost mode to deal with emergencies. If it does not exceed the threshold, it further comprehensively analyzes whether the pot bottom temperature reaches various critical thresholds (e.g., 60℃, 180℃, 220℃) and whether the temperature rise rate exceeds a set threshold, thereby accurately matching the corresponding operating mode. For example, when the temperature of the bottom of the pot rises rapidly and exceeds 180°C, even if the current concentration of oil fumes is not high, the system will determine in advance to enter the pre-frying mode, thereby realizing the pre-response and active intervention to the generation of oil fumes.

[0078] Once the target operating mode is determined, the system immediately converts its associated preset strategy into specific control commands and synchronously drives each actuator. The control commands are mainly divided into two paths: one path is sent to the drive unit of the main fan unit 4 to adjust its operating power to the level specified for that mode; the other path is sent to the drive unit (such as a stepper motor) of the flow distribution device (such as a three-way proportional regulating valve) in the multi-channel auxiliary airflow structure 3, which controls the valve core to rotate to a precise angle to achieve stepless and precise distribution of the airflow ratio to the first, second, and third channels.

[0079] Upon execution of the command, the main fan unit 4 and the multi-channel auxiliary airflow structure 3 immediately begin to work in tandem. The main fan establishes a basic negative pressure field, while simultaneously, air curtain airflow, wall-mounted guide airflow, and actively ejected airflow, in a preset ratio, are ejected from the lower edge, inner side, and upper outlet of the flap 2, respectively. These three auxiliary airflows, each with different functions, actively intervene and interact with the main negative pressure field, jointly and dynamically reshaping the overall airflow field above the stove. Its core synergistic effect lies in extending the effective oil fume capture negative pressure zone forward and downward, thus achieving negative pressure forward movement and achieving efficient capture before the oil fume diffuses.

[0080] This application achieves optimal power and airflow distribution strategies by dynamically matching them to different operating conditions, ensuring ultimate smoke extraction (manifested as a significant improvement in smoke removal rate) while effectively reducing operating noise and energy consumption. Ultimately, this system achieves a comprehensive performance of high-efficiency purification, quiet operation, and energy conservation in an ultra-thin model that does not require a physical lifting structure.

[0081] In conjunction with the second aspect, step S120 includes: S121, Determine whether the real-time oil fume concentration is greater than the preset concentration threshold; If yes, proceed to step S122; otherwise, proceed to step S123.

[0082] S122, The target operating mode is determined to be the emergency enhancement mode; wherein, the emergency enhancement mode corresponds to the first channel flow rate in the multi-channel auxiliary airflow structure reaching the upper limit value, while the third channel flow rate reaches the lower limit value.

[0083] S123, based on the comparison relationship between the bottom temperature of the pot and multiple preset temperature thresholds, and / or the comparison relationship between the bottom temperature rise parameter and multiple preset temperature rise thresholds, determine the target operating mode.

[0084] First, the real-time monitored concentration of cooking fumes is compared with a pre-set concentration threshold (threshold A) to instantly identify and respond to sudden, high-intensity cooking fume pollution events, such as the sudden generation of large amounts of dense smoke due to excessively high oil temperature in the pan, or extreme conditions caused by unexpected situations (such as flames leaping out of the pan). This is a safety protection and emergency response mechanism based on direct feedback signals, ensuring that the system has the fastest response path to the most urgent and severe risks of cooking fume emission, reflecting the design principle of safety first.

[0085] If the judgment result of S121 is yes (i.e., real-time oil fume concentration > preset threshold), the system will skip all routine analyses based on temperature and temperature rise, and directly determine the target operating mode as the emergency enhanced mode. This mode is specifically designed to deal with confirmed extreme high oil fume concentration conditions, and its goal is to take the most decisive measures to contain the spread of oil fumes in the shortest possible time.

[0086] Among them, the first channel 33 maximizes flow (air curtain enhancement) by allocating the vast majority of auxiliary airflow to the first channel 33 located at the lower edge of the flap. The purpose is to generate the strongest and densest vertical downward air curtain. The core function of this enhanced air curtain is to create an absolute spatial physical blockade, like an invisible air wall, to prevent the generated dense smoke from escaping forward (to the user's side) and laterally, firmly sealing it within the capture space formed by the air curtain, flap, and stove.

[0087] At the same time, the airflow allocated to the upper third channel 35 (active ejector channel) is significantly reduced. The logic behind this is that, in emergency enhanced mode, the main fan unit 4 is usually already operating at its highest power level (e.g., in overclocking mode), at which point the negative pressure suction at the main air inlet is already extremely strong. If more airflow is still allocated for upward ejection, it may interfere with or disrupt the blockade boundary constructed by the strong air curtain. Therefore, reducing the flow rate of the third channel 35 is to avoid unnecessary flow field disturbances, allowing the strongest air curtain blockade and the strongest active suction to form the most direct and effective combination.

[0088] In this mode, the airflow ratio of the second channel 34 (wall-mounted guide) will be maintained at a medium or high level, which can help maintain a certain air film protection and also guide the oil fumes trapped in the air curtain to the main air inlet.

[0089] If the judgment result of S121 is negative (i.e., the oil fume concentration does not exceed the standard), it indicates that the current situation is not an emergency oil fume pollution state. The system then enters a more refined and predictive second-level decision logic. This step is based entirely on two feedforward signals: the bottom temperature of the pot and its rate of change (temperature rise rate), and compares them with multiple preset thresholds.

[0090] Specifically, the system presets multiple temperature thresholds (e.g., T1=60°C, T2=180°C, T3=220°C) and temperature rise rate thresholds (e.g., V1=5°C / s, V2=10°C / s). By comparing the relationship between real-time temperature and these thresholds (e.g., "below T1", "between T1 and T2", "above T2"), and the relationship between temperature rise rate and rate thresholds, the system can accurately distinguish different stages of cooking thermodynamics.

[0091] Each stage, defined by temperature and rate of temperature rise, uniquely maps to a preset target operating mode. For example: A. When the pot bottom temperature is <60°C, the system is set to standby mode (the pot is not heated or is at a low temperature, and the system remains dormant). In this mode, the airflow distribution is as follows: First channel: Second channel: Third channel = 0:0:0 (Airflow system not activated).

[0092] B. If the pot bottom temperature is >60°C and the temperature rise rate is <5°C / s, it is set to pre-start mode, anticipating the preheating or simmering stage. A low-power flow field is established in advance to prevent oil fumes from escaping in the initial stage. The second channel has a higher proportion, aiming to form a protective gas film early; at this time, the airflow distribution is as follows: First channel: Second channel: Third channel = 20:30:10.

[0093] C. When the pot bottom temperature is between 60°C and 180°C, it is set to the normal mode (balanced suction) and is in a stable cooking stage (such as frying or boiling), maintaining balanced suction and ensuring a balance between performance and quiet operation; at this time, the airflow distribution is as follows: First channel: Second channel: Third channel = 30:40:30.

[0094] D. If the pot bottom temperature >180°C or the temperature rise rate >10°C / s, it is determined to be in pre-stir-fry mode (strengthening the air curtain and airflow in advance). This is understandable, as 180°C is close to the smoke point of most cooking oils, and a rapid temperature rise rate indicates that stir-frying is about to begin. Strengthening the air curtain and wall-mounted airflow in advance allows for better control; the main fan unit 4 does not reach its maximum speed to balance energy saving and noise reduction. At this time, the airflow distribution is as follows: First channel: Second channel: Third channel = 40:45:15.

[0095] E. When the pot bottom temperature exceeds 220°C, the system is activated to high-power stir-fry mode (full-speed operation), entering a high-fume intensity stage. The system operates at full capacity, with both the main fan unit 4 and the airflow system operating at high efficiency. At this time, the airflow distribution is as follows: First channel: Second channel: Third channel = 45:45:10.

[0096] F. If the pot bottom temperature exceeds 60°C and remains above 30°C for 30 seconds, the system enters the final cleaning mode. At this point, the main fan's power is reduced to a complete shutdown, indicating the cooking process is finished and the cookware has cooled. The system then executes a cleaning program, focusing on using the second channel's high-speed airflow to clean the flap. The airflow distribution at this time is as follows: First channel: Second channel: Third channel = 10:70:20.

[0097] The above mapping relationship reflects the intelligent control logic of the system from feedforward prediction to steady-state operation and then to final maintenance. By dynamically adjusting the airflow distribution and fan power, noise and energy consumption are optimized while ensuring the suction effect.

[0098] Thirdly, embodiments of this application provide an electronic device, combined with Figure 8 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.

[0099] Furthermore, combined Figure 8 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.

[0100] 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 8 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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, characterized in that, The range hood includes: Organism; The main fan unit is installed inside the machine body; A flap, hinged to the body; A multi-channel auxiliary airflow structure is fixedly integrated into the back of the flap; The multi-channel auxiliary airflow structure works in conjunction with the main fan device to form a dynamic flow field above the stove by using auxiliary airflows with adjustable flow rates ejected from the outlets of each airflow ejection channel, thereby achieving the forward shift of the negative pressure zone for smoke extraction.

2. The range hood according to claim 1, characterized in that, The multi-channel auxiliary airflow structure includes: An auxiliary fan is located inside the range hood body and is used to provide an independent airflow source; A flow distribution device, the inlet of which is connected to the outlet of the auxiliary fan; At least two airflow ejection channels, the inlet of each airflow ejection channel is connected to the corresponding outlet of the flow distribution device, and the outlet of each airflow ejection channel is respectively set at the corresponding target position of the flap and facing the corresponding target direction; The flow distribution device is adjusted to regulate the flow rate ratio of the airflow to each of the airflow ejection channels.

3. The range hood according to claim 1, characterized in that, The airflow ejection channel includes: The first channel has an outlet located at the lower edge of the flap, through which airflow forms a vertically downward air curtain. The second channel has an outlet located in the middle of the inner surface of the flap, and a guide surface is provided in front of its outlet. The airflow passes through to form a guide airflow that flows against the inner wall of the flap. The third channel has an outlet located above the outlet of the second channel, through which airflow forms an ejector flow.

4. The range hood according to claim 3, characterized in that, The guide surface in front of the second channel outlet is a Coanda surface.

5. The range hood according to claim 2, characterized in that, The flow distribution device is connected to the drive device and is driven to rotate by the drive device to adjust the flow rate ratio of each airflow outlet channel.

6. The range hood according to claim 5, characterized in that, It also includes a main control unit, which is communicatively connected to the flow distribution device, auxiliary fan and main fan device in the multi-channel auxiliary airflow structure, and is used to automatically adjust the airflow ratio of each channel and the power of the main fan according to the cooking conditions.

7. The range hood according to claim 6, characterized in that, The main control unit is connected to the oil fume concentration sensor and the temperature sensing module respectively; the oil fume concentration sensor is used to detect the oil fume concentration; the temperature sensing module is used to detect the temperature at the bottom of the cookware or inside the pot.

8. A control method for a range hood, characterized in that, The method is applied to the range hood according to any one of claims 1-7; the method includes: Obtain the current cooking parameters, including oil fume parameters, pot bottom temperature, and pot bottom temperature rise parameters; Based on the current cooking parameters, the target operating mode of the range hood is determined; the target operating mode is associated with the preset power level of the main fan device and the flow distribution ratio of each airflow outlet channel in the multi-channel auxiliary airflow structure; Based on the target operating mode, the range hood is controlled to operate in accordance with the target operating mode.

9. The method according to claim 8, characterized in that, The step of determining the target operating mode of the range hood based on the current cooking parameters includes: Determine whether the real-time oil fume concentration is greater than the preset concentration threshold; If so, the target operating mode is determined to be the emergency enhancement mode; wherein, the emergency enhancement mode corresponds to the first channel flow rate in the multi-channel auxiliary airflow structure reaching the upper limit value, while the third channel flow rate reaches the lower limit value.

10. The method according to claim 9, characterized in that, After determining whether the real-time oil fume concentration exceeds a preset concentration threshold, the process also includes: If not, the target operating mode is determined based on the comparison relationship between the bottom temperature of the pot and multiple preset temperature thresholds, and / or the comparison relationship between the bottom temperature rise parameter and multiple preset temperature rise thresholds.

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