A fresh air air curtain device that can be used with a range hood

Abstract

The utility model relates to kitchen appliance technical field especially, more particularly to a new trend air curtain device that can cooperate with range hood uses, the utility model provides a new trend air curtain device that can cooperate with range hood uses including air supply pipeline, booster system and air outlet subassembly, booster system sets up in air supply pipeline, is used for the gas in air supply pipeline is carried out booster delivery, air outlet subassembly with the output end intercommunication of air supply pipeline, air outlet subassembly sets up at least one side of the cooking bench, and air outlet subassembly has high -speed air supply mouth, wherein, the directional flow gas stream that high -speed air supply mouth sent forms the air curtain between air outlet subassembly and range hood, and the air curtain is used for the oil fume diffusion that the oil fume that generates at the cooking bench is blocked, the new trend air curtain device that the utility model provides can cooperate with range hood uses can carry out the active blocking to the oil fume, improves the processing effect to the oil fume.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a fresh air curtain device that can be used in conjunction with a range hood. Background Technology

[0002] With the improvement of people's living standards and the enhancement of health awareness, the air quality of the kitchen environment is receiving increasing attention. During the cooking process, especially the high-temperature cooking methods such as frying, stir-frying, and deep-frying in Chinese cuisine, a large amount of oil fumes are generated. These fumes contain a variety of harmful substances, including particulate matter, volatile organic compounds, and polycyclic aromatic hydrocarbons. They not only affect the health of the cooks but also pollute the kitchen environment, forming oil stains on surfaces such as walls and cabinets, affecting the cleanliness and aesthetics of the kitchen.

[0003] Currently, kitchen fume treatment mainly relies on range hoods, which extract and exhaust fumes outdoors using negative pressure suction. However, traditional range hood methods have significant technical limitations. The suction range of a range hood is limited; it typically only generates effective negative pressure in areas close to the air inlet, making it difficult to effectively capture fumes that are further away or off-center. In actual cooking, fumes are generated instantaneously and dispersedly, especially during high-heat cooking such as stir-frying, where large amounts of fumes rapidly spread in a short time. The range hood's suction response has a certain lag, failing to establish an effective capture range immediately upon fume generation, causing a considerable portion of the fumes to escape to other areas of the kitchen.

[0004] Furthermore, during cooking, the cook is very close to the stove, and cooking fumes mixed with heat spread directly into the kitchen. Especially in summer, cooks often end up drenched in sweat after a meal, making their experience very uncomfortable. In addition, when there is cross-flow interference in the kitchen, such as from open windows, air conditioning, or movement of people, the range hood's suction effect is further affected, causing fumes that should flow towards the hood to deviate from their intended path, increasing the possibility of fumes escaping. In some kitchen layouts, due to space constraints or aesthetic requirements, the range hood may not be installed at an ideal height, further weakening its ability to control cooking fumes.

[0005] Another pain point of existing range hoods and cooktops is that they use a passive, high-volume suction principle, requiring the kitchen to be open during cooking to supplement the range hood's airflow. To maximize smoke extraction, manufacturers use very high airflow rates, creating a strong airflow duct between the window and the hood. The cook is directly exposed to this duct, especially in winter when the outdoor air is cold, severely impacting their shoulders, head, and even the whole body, causing chills, colds, and fevers. Simultaneously, it significantly lowers indoor temperature, resulting in wasted heating energy.

[0006] Existing technologies have also yielded some improvements, such as increasing the power and suction area of ​​the range hood, or installing localized exhaust devices around the stove. However, these solutions either increase the complexity and energy consumption of the equipment, or still fail to fundamentally solve the problem of controlling the diffusion of cooking fumes. While increasing power can improve suction capacity, it also leads to increased noise and energy consumption; localized exhaust devices expand the suction range to some extent, but are still a passive approach and cannot actively prevent the initial diffusion of cooking fumes. Utility Model Content

[0007] This invention provides a fresh air curtain device that can be used with a range hood. This fresh air curtain device can actively block oil fumes, improve the treatment effect of oil fumes, and improve comfort.

[0008] This utility model embodiment provides a fresh air curtain device that can be used with a range hood, comprising: an air supply duct with its input end located outdoors; a pressurization system disposed in the air supply duct for pressurizing and transporting the gas in the air supply duct; and an air outlet assembly connected to the output end of the air supply duct, the air outlet assembly being disposed on at least one side of the stove, the air outlet assembly having a high-speed air outlet; wherein, the directional airflow delivered by the high-speed air outlet forms an air curtain between the air outlet assembly and the range hood, the air curtain being used to block the diffusion of oil fumes generated at the stove.

[0009] In one possible implementation, the air outlet assembly has an angle adjustment unit for adjusting the air delivery angle of the high-speed air outlet.

[0010] In one possible implementation, the air outlet assembly includes a variable cross-section duct connected to the air supply duct, the variable cross-section duct including a gradually expanding section and a gradually contracting section connected to the gradually expanding section.

[0011] In one possible implementation, the air outlet assembly is located indoors, the inlet of the air supply duct is located outdoors, and the inlet of the air supply duct is equipped with a first filter unit.

[0012] In one possible implementation, a heating component is also included, which exchanges heat with at least a portion of the air supply duct to heat the gas within the air supply duct.

[0013] In one possible implementation, the heating assembly includes: a heating pipe connected in parallel with the air supply pipe, wherein a regulating valve is provided at the connection between the heating pipe and the air supply pipe; and a heater for heat exchange with the heating pipe.

[0014] In one possible implementation, the heater includes a waste heat recovery unit for a range hood, a waste heat recovery unit for a stove, or an electric heating unit.

[0015] In one possible implementation, it further includes: a lifting mechanism, which is mounted on the range hood, and the bottom lifting end of the lifting mechanism is connected to the air outlet component; wherein the air outlet component includes a first state located on one side of the stove and a second state housed inside the range hood, and the lifting mechanism is used to drive the air outlet component to switch between the first state and the second state.

[0016] In one possible implementation, the air outlet assembly is rotatably connected to the bottom lifting end of the lifting mechanism for switching between a horizontal and a vertical state.

[0017] In one possible implementation, the air outlet assembly is mounted on the tabletop, supports the cooktop, and has a detachable grille at the high-speed air outlet.

[0018] In one possible implementation, the height of the high-speed air outlet is higher than the desktop.

[0019] In one possible implementation, an ion generator is also included, connected to the air supply duct, for ionizing the gas in the air supply duct.

[0020] In one possible implementation, a control system is also included, comprising: a first temperature sensor for detecting the gas temperature at the high-speed air outlet or within the air outlet assembly; a flow sensor for detecting the gas flow rate at the high-speed air outlet; and a controller electrically or communicatively connected to the first temperature sensor, the flow sensor, the pressurization system, and the heating assembly, for controlling the heating assembly and the pressurization system based on the gas temperature and flow rate.

[0021] In one possible implementation, the control system further includes: a second temperature sensor for detecting the temperature of incoming fresh air from the outside; and a third temperature sensor for detecting the indoor ambient temperature; wherein the second temperature sensor and the third temperature sensor are electrically connected or communicatively connected to the controller, respectively.

[0022] In one possible implementation, the control system further includes: a pressure detection unit for detecting the negative pressure value of the range hood; and a gas detection unit for detecting the gas concentration; wherein the controller is electrically or communicatively connected to the pressure detection unit, the gas detection unit, and the range hood.

[0023] In one possible implementation, a second filter unit is installed in the air supply duct.

[0024] This utility model provides a fresh air curtain device that can be used with a range hood. Through the coordinated operation of an air supply duct, a pressurization system, and an air outlet assembly, a stable air curtain barrier is formed between the stove and the range hood, fundamentally solving the technical problem of the lack of active oil fume diffusion blocking methods in existing technologies. Specifically, the pressurization system pressurizes the gas in the air supply duct, giving it sufficient kinetic energy, which is then released through the high-speed air outlet of the air outlet assembly to form a directional airflow. This directional airflow forms a continuous airflow barrier within a specific space between the stove and the range hood, effectively intercepting oil fumes at the first moment of their generation, actively preventing the multi-directional diffusion of oil fumes into the surrounding space, and simultaneously guiding the oil fumes towards the range hood for centralized treatment. Compared to the traditional passive approach of relying solely on the negative pressure suction of a range hood, active air curtain technology represents a fundamental improvement in fume control. The air curtain barrier formed by directional airflow effectively intercepts fumes the moment they are generated, overcoming the limitations of the range hood's suction range and achieving fume control over a larger area. This effectively solves the problems of traditional range hoods, such as suction lag, limited coverage, and susceptibility to airflow interference. While blocking fumes, it also blocks the heat generated by the cooktop, reducing heat transfer to the cook during summer cooking. This solution also incorporates airflow temperature control to prevent heat loss to the cook and the kitchen environment from cold air in winter, greatly increasing the cook's comfort. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of a fresh air curtain device that can be used in conjunction with a range hood, provided by this utility model.

[0027] Figure 2 This is a side view of the structure of an air curtain device, a range hood, and a lifting mechanism provided by this utility model.

[0028] Figure 3 This is a front view structural diagram of an air curtain device, a range hood, and a lifting mechanism provided by this utility model.

[0029] Figure 4 This is a structural diagram of an air outlet component, a stove, and a range hood provided by this utility model.

[0030] Figure 5This is a schematic diagram of another fresh air curtain device that can be used with a range hood, provided by this utility model.

[0031] Figure 6 This is a structural schematic diagram of an air outlet component provided by this utility model.

[0032] Figure 7 This is a structural schematic diagram of the high-speed air outlet of an air outlet component provided by this utility model.

[0033] Figure 8 This is a structural schematic diagram of another air outlet component provided by this utility model at the high-speed air outlet.

[0034] Figure 9 This is a schematic diagram of another air outlet component provided by this utility model after removing the grille.

[0035] Figure 10 This is a circuit control block diagram provided by this utility model.

[0036] Figure 11 This is a structural schematic diagram of an air outlet component provided by this utility model.

[0037] Figure label:

[0038] 1. Air supply duct; 11. First filter unit; 12. Second filter unit;

[0039] 2. Boosting system;

[0040] 3. Air outlet assembly; 31. High-speed air outlet; 32. Grille; 33. Air distribution block; 34. Flow control valve; 35. Movable bottom cover;

[0041] 4. Heating assembly; 41. Heating piping; 42. Regulating valve; 43. Heater; 44. Check valve;

[0042] 5. Lifting mechanism; 6. Ion generator; 7. Stovetop; 8. Range hood;

[0043] 9. Control system; 91. First temperature sensor; 92. Flow sensor; 93. Controller; 94. Pressure detection unit; 95. Gas detection unit; 96. Second temperature sensor; 97. Third temperature sensor. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0045] The following is combined with Figure 1-11 This invention describes a fresh air curtain device that can be used with a range hood, comprising: an air supply duct 1; a pressurization system 2 disposed in the air supply duct 1 for pressurizing and transporting the gas in the air supply duct 1; and an air outlet assembly 3 connected to the output end of the air supply duct 1, the air outlet assembly 3 being disposed on at least one side of the stove 7, the air outlet assembly 3 having a high-speed air outlet 31; wherein, the directional airflow delivered by the high-speed air outlet 31 forms an air curtain between the air outlet assembly 3 and the range hood 8, the air curtain being used to block the diffusion of oil fumes generated at the stove 7.

[0046] In this invention, the coordinated operation of the air supply duct 1, the pressurization system 2, and the air outlet assembly 3 achieves the beneficial effect of forming a stable air curtain barrier between the stove 7 and the range hood 8. The pressurization system 2 pressurizes the gas in the air supply duct 1, giving it sufficient kinetic energy, and then releases it through the high-speed air outlet 31 of the air outlet assembly 3 to form a directional airflow. This directional airflow forms a continuous airflow barrier within a specific space, effectively preventing the oil fumes generated by the stove 7 from spreading to the surrounding space, while guiding the oil fumes to the range hood 8 for centralized treatment.

[0047] Specifically, the air supply duct 1 serves as the main channel for gas delivery, providing a stable gas source for the entire system; the pressurization system 2 increases the gas pressure and flow rate through mechanical pressurization, ensuring that the exhaust air has sufficient kinetic energy to form an effective air curtain; the air outlet assembly 3 is located on at least one side of the stove 7, and its high-speed air outlet 31 can release the pressurized gas in a directional flow, forming an airflow layer with a certain thickness and intensity. This directional airflow forms a clear dynamic boundary with the still air, constituting a physical barrier to block the diffusion path of cooking fumes.

[0048] In one specific embodiment, when a cook stir-fries on a gas stove, a large amount of oil fumes are instantly generated and spread outwards. Traditionally, these fumes quickly permeate the entire kitchen space, affecting not only the cook's vision and breathing but also depositing grease on kitchen surfaces. However, with the air curtain device of this invention, the directional airflow released from the high-speed air outlet 31 forms an invisible "air wall" around the stove 7, effectively intercepting the lateral spread of oil fumes and confining them to a specific area. Then, under the negative pressure of the range hood 8, they are guided and extracted in an orderly manner, significantly improving the quality of the kitchen environment.

[0049] In related technologies, traditional kitchen fume treatment mainly relies on a single range hood 8 device, which treats the fumes through negative pressure suction. However, this passive treatment method has obvious drawbacks: First, the suction range is limited, and fumes farther away from the range hood 8 can easily escape; second, at the moment the fumes are generated, the suction power cannot immediately cover the entire fume diffusion area; third, when cooking movements are vigorous or there is lateral airflow interference, the fumes can easily deviate from the suction range; fourth, in winter, due to the suction of the range hood, a cold air passage is formed between the air inlet window, the cook, and the range hood, making the cook feel cold and uncomfortable; at the same time, a large amount of indoor heat is lost, resulting in energy waste.

[0050] In this embodiment of the invention, a fundamental improvement in fume control is achieved through active air curtain technology. The air curtain barrier formed by the directional airflow can effectively intercept fumes the moment they are generated, without relying on the limited suction range of the range hood 8, thus achieving fume control in a larger space. At the same time, the continuity and stability of the air curtain ensure that an effective barrier effect is maintained even in complex cooking environments, and it also increases the temperature control of the airflow, fundamentally solving the limitations of traditional single suction methods.

[0051] In some embodiments, the air outlet assembly 3 has an angle adjustment unit for adjusting the air delivery angle of the high-speed air outlet 31. The angle adjustment unit can be adjusted manually or by a motor driving the air guide plate to rotate to adjust the air delivery angle.

[0052] In this invention, by setting an angle adjustment unit on the air outlet assembly 3, the air delivery angle of the high-speed air outlet 31 can be flexibly adjusted, thereby achieving the beneficial effect of significantly improving the adaptability of the air curtain. When the airflow direction forms an appropriate angle with the direction of oil fume diffusion, the blocking efficiency can be maximized; and by adjusting the air delivery angle, the coverage and blocking strength of the air curtain can be optimized according to different cooking conditions, stove height, range hood 8 position, and other factors.

[0053] Specifically, the angle adjustment unit uses a mechanical transmission mechanism to change the angle of the high-speed air outlet 31 in both horizontal and vertical directions. Horizontally, angle adjustment alters the lateral coverage of the air curtain, adapting to different widths of the cooktop 7. Vertically, it controls the height distribution of the air curtain, ensuring effective blocking at various cooking heights. The adjustment range of the angle adjustment unit is typically designed to be ±30° to ±60°, ensuring sufficient flexibility while avoiding airflow dispersion issues that may result from excessively large angle adjustments. Optionally, in special circumstances, the adjustment range can reach ±90°. In the event of an abnormal gas leak, the air outlet assembly can quickly disperse fresh air horizontally, preventing excessively high gas concentrations and potential hazards.

[0054] In some embodiments, the air outlet assembly 3 includes a variable cross-section air duct connected to the air supply duct 1, the variable cross-section air duct including a gradually expanding section and a gradually contracting section connected to the gradually expanding section.

[0055] In this invention, by incorporating a variable cross-section air duct including a gradually expanding section and a gradually contracting section in the air outlet assembly 3, the beneficial effects of optimized airflow velocity and significantly improved air curtain stability are achieved. This technical feature is based on the Venturi effect principle in fluid mechanics: when fluid passes through a pipe with a gradually changing cross-section, the flow velocity increases and the pressure decreases in the contracting section, while the flow velocity decreases and the pressure increases in the expanding section. By rationally designing the geometric parameters of the expanding and contracting sections, precise control of the airflow velocity distribution can be achieved, while reducing the generation of eddies and turbulence.

[0056] Specifically, the expanding section of the variable cross-section duct first receives airflow from the supply duct 1. Its cross-sectional area gradually increases along the flow direction, moderately reducing the airflow velocity and correspondingly increasing the pressure, providing stable airflow conditions for the subsequent acceleration process. The contracting section connects to the expanding section, and its cross-sectional area gradually decreases along the flow direction. According to the continuity equation and Bernoulli's equation, the airflow velocity increases significantly when passing through the contracting section, gaining sufficient kinetic energy to form a high-speed jet. The geometric design of the expanding and contracting sections requires precise calculations, typically employing a gradually changing conical or parabolic transition to avoid airflow separation and energy loss that may occur due to abrupt changes in cross-section.

[0057] like Figure 1 As shown, in some embodiments, the air outlet assembly 3 is located indoors, the input end of the air supply duct 1 is located outdoors, and the input end of the air supply duct 1 is provided with a first filter unit 11.

[0058] In this invention, by placing the air outlet assembly 3 indoors and the inlet of the air supply duct 1 outdoors, and configuring a first filter unit 11, the beneficial effects of introducing fresh air and ensuring air quality are achieved. Outdoor air contains a higher oxygen concentration and fewer oil fume pollutants than the polluted air in the kitchen. Introducing fresh outdoor air into the room through a dedicated air supply duct 1 can improve the air environment in the kitchen. The first filter unit 11 pre-treats the outdoor air, removing pollutants such as dust, pollen, and PM2.5, ensuring the cleanliness of the introduced air.

[0059] Specifically, the indoor-outdoor separation configuration achieves the separation of clean air source from polluted environment through physical partition. The inlet opening of the air supply duct 1 is located in a well-ventilated outdoor location to avoid the influence of kitchen fumes and other pollution sources, ensuring the freshness of the air source. The first filter unit 11 typically adopts a multi-stage filtration structure, including a coarse filter layer, a medium filter layer, and a fine filter layer, which can effectively remove particulate matter of different sizes: the coarse filter layer intercepts larger dust and impurities, the medium filter layer handles medium-sized pollutants, and the fine filter layer removes fine particles and some harmful gases. The air cleanliness after three-stage filtration can meet indoor air quality standards.

[0060] like Figure 1 As shown, in some embodiments, a heating component 4 is also included, which exchanges heat with at least a portion of the air supply duct 1 to heat the gas in the air supply duct 1.

[0061] In this invention, by setting a heating component 4 that exchanges heat with the air supply duct 1, the beneficial effects of significantly improving air supply temperature regulation and user comfort are achieved. In cold seasons or low-temperature environments, directly using outdoor cold air to form an air curtain can cause discomfort to the cook and even affect the flexibility of cooking operations; by preheating the gas in the air supply duct 1 through the heating component 4, the air curtain temperature can be adjusted to a suitable range, maintaining the barrier effect of the air curtain while avoiding the discomfort of direct cold air blowing.

[0062] Specifically, the heating component 4 heats the gas through heat exchange with at least a portion of the air supply duct 1. The heat exchange process follows the basic laws of heat conduction and convection: the heat generated by the heating component 4 is transferred to the flowing gas through the duct wall, causing the gas temperature to gradually increase. To ensure heat exchange efficiency, the heating component 4 is typically positioned in the middle section of the air supply duct 1, ensuring sufficient heat exchange time while avoiding energy waste that may result from overheating. The control of the heating power needs to comprehensively consider factors such as air volume, ambient temperature, and target temperature, and is usually designed to be adjustable to adapt to different usage requirements.

[0063] In some embodiments, the heating assembly 4 includes: a heating pipe 41, which is connected in parallel with the air supply pipe 1, and a regulating valve 42 is provided at the connection between the heating pipe 41 and the air supply pipe 1; and a heater 43, which exchanges heat with the heating pipe 41.

[0064] Optionally, the heating assembly 4 also includes a one-way valve 44 through which the heated gas is returned to the air supply line 1, ensuring that the heated gas returns to the air supply line 1 instead of entering the heater 43 and the heating line 41 in reverse from the air supply line 1.

[0065] In this invention, by setting up a heating pipe 41 in parallel with the air supply pipe 1 and configuring a regulating valve 42 at the connection, and simultaneously setting up a heater 43 for heat exchange with the heating pipe 41, the beneficial effects of split heating and precise temperature control are achieved. The regulating valve 42 controls the proportion of airflow entering the heating pipe 41. The unheated main airflow and the fully heated split airflow are remixed downstream. By adjusting the ratio of the two airflows, the final air supply temperature is precisely controlled. This split heating method has higher control accuracy and energy efficiency compared to direct full-flow heating.

[0066] Specifically, the parallel-connected heating pipe 41 branches off a portion of the airflow from the main channel of the air supply pipe 1. This portion of the airflow is fully heated by a dedicated heater 43, achieving a relatively high temperature of 50-80℃. A regulating valve 42 is installed at the connection between the heating pipe 41 and the air supply pipe 1. The opening of the regulating valve 42 controls the airflow entering the heating pipe 41, thereby achieving precise adjustment of the heating airflow ratio. The heater 43 and the heating pipe 41 exchange heat efficiently. Due to the relatively small airflow in the heating pipe 41, the heater 43 can achieve high temperature output with low power consumption, improving the overall system's energy efficiency ratio. Finally, the heated high-temperature airflow and the unheated room-temperature airflow re-merge downstream of the pipe, achieving precise control of the target temperature through fluid mixing.

[0067] In some embodiments, the heater 43 includes a waste heat utilization unit for oil fumes from the range hood 8, a waste heat utilization unit for the stove, or an electric heating unit.

[0068] In this invention, by setting a heater 43 that includes either a waste heat recovery unit for the range hood 8 or an electric heating unit, the beneficial effects of diversified heat source selection and efficient energy utilization are achieved. The range hood 8 generates a large amount of waste heat during operation, including heat from the motor and heat from the extracted high-temperature fumes. This waste heat is usually directly discharged outdoors, resulting in energy waste. The waste heat recovery unit recovers this heat energy for gas heating, achieving secondary energy utilization. The electric heating unit serves as an alternative or supplementary heat source, ensuring that heating needs are met under various operating conditions.

[0069] Specifically, the waste heat recovery unit for cooking fumes recovers heat from the exhaust duct of the range hood 8 through a heat exchanger, utilizing the temperature difference between the high-temperature cooking fumes and the gas to be heated for heat transfer. Since the temperature of cooking fumes is typically in the range of 60-120℃, possessing a high heat energy grade, a properly designed heat exchanger can effectively recover 50-70% of the heat. The electric heating unit uses resistance heating or PTC heating elements, offering advantages such as rapid start-up, precise control, and easy installation. It can be used as a supplementary heat source when waste heat is insufficient or as an independent heat source. The two heating methods can operate independently or in combination, automatically switching or combining according to actual heat load requirements and available heat sources.

[0070] In some embodiments, the system further includes a lifting mechanism 5, which is disposed on the range hood 8, and the bottom lifting end of the lifting mechanism 5 is connected to the air outlet assembly 3; wherein the air outlet assembly 3 includes a first state located on one side of the stove 7 and a second state housed inside the range hood 8, and the lifting mechanism 5 is used to drive the air outlet assembly 3 to switch between the first state and the second state.

[0071] In this invention, by setting a lifting mechanism 5 on the range hood 8 and connecting it to the air outlet component 3, the air outlet component 3 can be freely switched between working and retracted states, achieving the beneficial effects of space saving and significantly improved ease of use. The lifting mechanism 5 drives the air outlet component 3 to move vertically through a precise mechanical transmission system. When the air curtain function is needed, the lifting mechanism 5 lowers the air outlet component 3 from its retracted position inside the range hood 8 to its working position on the side of the stove 7; when not in use, the lifting mechanism 5 raises the air outlet component 3 and retracts it into the range hood 8, achieving a perfect balance between functional requirements and spatial aesthetics.

[0072] Specifically, the lifting mechanism 5 includes core components such as a drive motor, a transmission mechanism, and a guide mechanism. The drive motor provides lifting power, typically using a stepper motor or servo motor to ensure positioning accuracy; the transmission mechanism converts the motor's rotational motion into linear motion, commonly employing screw and nut mechanisms, gear and rack mechanisms, or wire rope and pulley mechanisms; the guide mechanism ensures the stability and accuracy of the air outlet assembly 3 during lifting, preventing swaying and jamming. The bottom lifting end of the lifting mechanism 5 is firmly connected to the air outlet assembly 3, forming an integrated moving unit. The first state is the working state of the air outlet assembly 3, at which point the air outlet assembly 3 is located at a preset height on one side of the stovetop 7; the second state is the retracted state of the air outlet assembly 3, at which point the air outlet assembly 3 is completely retracted into the range hood 8, without occupying kitchen space.

[0073] The bottom of the lifting mechanism 5 is connected to the rear end of the air outlet component 3. When the air outlet component 3 is lowered to the outside of the stove 7, it can reduce the space occupied above the stove 7, making it more convenient for users and improving the user experience.

[0074] In some embodiments, the air outlet assembly 3 is rotatably connected to the bottom lifting end of the lifting mechanism 5 for switching between a horizontal state and a vertical state.

[0075] In this invention, by setting a rotatable connection between the air outlet component 3 and the bottom lifting end of the lifting mechanism 5, the air outlet component 3 can be flexibly switched between a horizontal and a vertical state, achieving beneficial effects of posture adjustment and optimized storage. This technical feature is based on the principles of multi-degree-of-freedom mechanical connection and spatial geometry optimization: the rotatable connection provides the air outlet component 3 with a degree of rotational freedom around the horizontal axis, enabling it to increase angle adjustment capability on the basis of vertical lifting motion; the horizontal state is suitable for the normal operation of the air curtain, while the vertical state is suitable for compact storage, achieving dual optimization of functionality and space utilization through state switching.

[0076] Specifically, the rotatable connection typically employs a bearing-type or hinge-type structure, providing the air outlet assembly 3 with a rotation range of 0-90°. The rotation axis is perpendicular to the lifting direction, ensuring that the air outlet assembly 3 can be angled within the horizontal plane. The horizontal state is the working posture of the air outlet assembly 3; in this state, the high-speed air outlet 31 is parallel to the ground or tilted at a slight angle, and the airflow direction is basically parallel to or at a certain angle to the surface of the cooktop 7, forming an effective air curtain barrier. The vertical state is the storage posture of the air outlet assembly 3; in this state, the air outlet assembly 3 is perpendicular to the ground, occupying minimal horizontal space, facilitating compact storage within the range hood 8. The rotation process is achieved through electric drive or manual operation, and the rotation speed and angle can be precisely controlled, ensuring smooth switching and positioning accuracy.

[0077] In some embodiments, the air outlet assembly 3 is disposed on the tabletop, the air outlet assembly 3 supports the stove 7, and a grille 32 is detachably provided at the high-speed air outlet.

[0078] In this invention, by placing the air outlet assembly 3 on the tabletop and supporting the stove 7, and arranging it around the stove 7 with a detachable grille 32 at the high-speed air outlet, a three-dimensional surround air curtain and convenient maintenance are achieved. By setting air outlets around the stove 7, a 360° all-around air curtain coverage is formed, completely eliminating any blind spots that might exist with single or double-sided air curtains. The tabletop-supported design provides a stable installation base and facilitates integration with the existing kitchen environment. The detachable grille 32 design addresses both airflow rectification and cleaning / maintenance needs.

[0079] Specifically, the air outlet assembly 3 integrates the air curtain system into the work surface via a specialized support structure, forming an integrated kitchen work platform. The cooktop 7 rests on the air outlet assembly 3, ensuring precise positioning between the cooktop 7 and the air curtain system. The surrounding design features high-speed air vents in the front, back, left, and right directions of the cooktop 7, each independently controllable and adjustable according to cooking needs and air curtain effect. The grille 32 is detachable, secured to the air outlet surface via clips, magnets, or threads, effectively rectifying the airflow for a more uniform and stable air curtain, while also facilitating regular disassembly for cleaning and maintenance.

[0080] In some embodiments, the height of the high-speed air outlet is higher than the tabletop.

[0081] In this invention, by setting the high-speed air outlet higher than the tabletop, precise control of the effective coverage height of the air curtain and a significant improvement in the efficiency of oil fume interception are achieved, while preventing water and oil overflowing from the pot from flowing into the high-speed air outlet. After being generated, oil fumes primarily diffuse within a height range of 0.2-0.8 meters above the surface of the stovetop. By placing the air outlet above the tabletop, an effective barrier is formed within the critical height range of the air curtain. Simultaneously, the appropriate height setting also prevents the airflow from interfering with tabletop operations, ensuring the normal progress of cooking activities.

[0082] Specifically, the height of the high-speed air vent needs to comprehensively consider multiple factors, including the height of the cooktop, the characteristics of oil fume diffusion, and operational comfort. Generally, the standard kitchen countertop height is 800-850mm, and the gas stove surface is usually 10mm-20mm above the countertop. The main diffusion area of ​​oil fumes is within 100-600mm above the stove surface. By placing the high-speed air vent at a height of 10mm-50mm above the countertop, effective interception can be achieved in the key area of ​​oil fume diffusion. This height ensures effective coverage of oil fumes by the air curtain while avoiding interference with hand operations, achieving the best balance between functionality and practicality.

[0083] like Figure 6 As shown, the air outlet assembly 3 includes multiple air outlet pipes arranged around the stove 7. The air outlet assembly also includes a gas distribution block 33 and a flow control valve 34. The gas distribution block 33 distributes high-pressure gas to the multiple air outlet pipes, and the flow control valve 34 controls the amount of airflow entering each air outlet pipe.

[0084] Preferably, the heating component 4 can be located at the gas distribution block 33, which can reduce the space occupied by the gas in the storage space below the stove 7. The gas can be heated by electric heating or by exchanging heat with the heat generated by the stove 7 during operation.

[0085] Optionally, the heating component 4 can also be installed in the air inlet duct 1 to heat the gas using electric heating.

[0086] In some embodiments, an ion generator 6 is also included, which is connected to the air supply duct 1 and is used to ionize the gas in the air supply duct 1.

[0087] In this invention, by installing an ion generator 6 connected to the air supply duct 1, the airflow ionization treatment and air purification functions are enhanced, achieving the beneficial effects of multiple purifications and the creation of a healthy environment. The ion generator 6 ionizes air molecules through a high-voltage electric field or ultraviolet irradiation, generating a large number of positive and negative ions. These ions have strong oxidizing and electrostatic adsorption capabilities, which can decompose organic pollutants in the air, inactivate bacteria and viruses, remove odor molecules, and promote the coagulation and sedimentation of suspended particulate matter, thereby achieving deep purification treatment of the airflow.

[0088] Specifically, the ion generator 6 ionizes the passing gas using a specialized ionization device. Common ionization methods include corona discharge, dielectric barrier discharge, and photoionization, each of which generates high concentrations of active ions. The generated positive and negative ions are evenly distributed in the airflow. When the air curtain is released, these ions diffuse into the kitchen environment with the airflow, where they undergo oxidation-reduction reactions with airborne pollutants. The ions inactivate bacteria and viruses primarily by disrupting their cell walls and protein structures; they decompose organic pollutants through oxidation reactions, breaking down large molecular pollutants into harmless small molecules; and they treat particulate matter by promoting the aggregation of fine particles through electrostatic effects, facilitating subsequent sedimentation or filtration removal.

[0089] like Figure 10 As shown, in some embodiments, a control system 9 is also included. The control system 9 includes: a first temperature sensor 91 for detecting the gas temperature at the high-speed air outlet or in the air outlet assembly 3; a flow sensor 92 for detecting the gas flow rate at the high-speed air outlet; and a controller 93, which is electrically or communicatively connected to the first temperature sensor 91, the flow sensor 92, the pressurization system 2, and the heating assembly 4, for controlling the heating assembly 4 and the pressurization system 2 according to the gas temperature and flow rate.

[0090] In this invention, by setting up a control system 9 including a first temperature sensor 91, a flow sensor 92, and a controller 93, real-time monitoring and intelligent adjustment of air curtain parameters are achieved, resulting in a significant improvement in system operational stability and control accuracy. The first temperature sensor 91 and the flow sensor 92 monitor key parameters at the high-speed air outlet in real time. The controller 93 automatically adjusts the working state of the heating component 4 and the pressurization system 2 based on the deviation between the monitored data and the preset target value, forming a closed-loop control circuit to ensure that the air curtain parameters are always maintained in the optimal working state and to cope with emergencies.

[0091] Specifically, the first temperature sensor 91 uses a fast-response thermistor or thermocouple, installed near the high-speed air outlet, to accurately measure the outlet air temperature with a response time of 1-3 seconds. The flow sensor 92 uses turbine, hot-wire, or ultrasonic measurement principles to monitor the volumetric or mass flow rate of the airflow in real time, with a measurement accuracy of ±2%. The controller 93 uses a PID control algorithm or fuzzy control algorithm to calculate the optimal control output based on real-time data such as temperature, flow rate, and range hood motor torque. When the outlet air temperature is detected to be lower than the set value, the controller 93 automatically increases the power of the heating component 4; when the outlet air flow is detected to be insufficient, the controller 93 automatically increases the speed of the booster system 2. This multi-parameter coordinated control ensures the stability and consistency of the air curtain effect.

[0092] In one specific embodiment, the target parameters for the air curtain are set as a temperature of 18°C ​​and a flow rate of 300 m³ / h. 3 / h. During actual operation, due to factors such as changes in external ambient temperature and pipeline resistance, the outlet air parameters may deviate from the set value. Through real-time adjustment by the control system 9, when the first temperature sensor 91 detects that the outlet air temperature has dropped to 16℃, the controller 93 automatically adjusts the heating power within 30 seconds to restore the temperature to the range of 18±1℃; when the flow sensor 92 detects that the flow rate has dropped to 280m³ / h... 3 At a flow rate of / h, controller 93 automatically increases the power of booster system 2, restoring the flow rate to 300±10m³ within 1 minute. 3 Within a range of / h. This precise parameter control ensures the stability of the air curtain effect, avoiding the inaccuracies and lags of manual adjustments.

[0093] In some embodiments, the control system further includes: a second temperature sensor 96 for detecting the temperature of fresh air entering from the outside; and a third temperature sensor 97 for detecting the indoor ambient temperature; wherein the second temperature sensor 96 and the third temperature sensor 97 are electrically connected or communicatively connected to the controller 93, respectively.

[0094] In this invention, the temperature of the gas entering from the outside is detected by the second temperature sensor 96, and the indoor temperature is detected by the third temperature sensor 97. By comparing the indoor and outdoor temperatures, the controller promptly issues instructions to adjust the fresh air flow into the heating component 4 and whether to activate the electric heating unit, thereby regulating the indoor temperature.

[0095] In some embodiments, the control system 9 further includes: a pressure detection unit 94 for detecting the negative pressure value of the range hood 8; and a gas detection unit 95 for detecting the gas concentration; wherein the controller 93 is electrically or communicatively connected to the pressure detection unit 94, the gas detection unit 95, and the range hood 8.

[0096] In this invention, by adding a pressure detection unit 94 and a gas detection unit 95 to the control system 9 and achieving electrical or communication connection control with the range hood 8, beneficial effects of system synergy optimization and enhanced safety protection are achieved. The pressure detection unit 94 monitors the negative pressure state of the range hood 8, realizing intelligent coordination between the air curtain device and the range hood 8; the gas detection unit 95 monitors the gas concentration, providing early warning and emergency protection for gas leaks; the multi-sensor fusion control strategy realizes comprehensive monitoring and intelligent management of the kitchen environment.

[0097] Specifically, the pressure detection unit 94 monitors the negative pressure value inside the range hood 8 or in the duct in real time through a pressure sensor. The magnitude of the negative pressure reflects the working status and suction capacity of the range hood 8. When the range hood 8 is working under high load, the negative pressure value is large, and the air curtain device can correspondingly increase the airflow intensity to cooperate with the powerful suction of the range hood 8; when the range hood 8 is working under low load, the negative pressure value is small, and the air curtain device can appropriately reduce the airflow intensity to avoid the excessively strong air curtain affecting the natural flow of fumes. The gas detection unit 95 uses a catalytic combustion or electrochemical gas sensor to detect the concentration of combustible gases such as natural gas and liquefied petroleum gas, with a detection accuracy of ppm level. The electrical or wireless communication connection between the controller 93 and the range hood 8 enables the two devices to achieve information sharing and collaborative control, forming an integrated kitchen environment control system 9.

[0098] In one specific embodiment, when stir-frying over high heat, the pressure detection unit 94 detects that the negative pressure value of the range hood 8 has reached a preset value, indicating that the range hood 8 is in a high-power suction state. Upon receiving this signal, the controller 93 automatically adjusts the airflow of the air curtain to its maximum value, forming a powerful air curtain that works in conjunction with the powerful suction of the range hood 8 to achieve optimal fume control. When the gas detection unit 95 detects that the gas concentration exceeds a safety threshold (e.g., reaching 25% of the lower explosive limit), the controller 93 immediately activates an emergency procedure: forcibly opening the air curtain device for ventilation and dilution, simultaneously sending a signal to the range hood 8 to activate maximum power suction, and issuing an audible and visual alarm to remind the user to check the gas equipment. Alarm information can also be sent via a mobile app. This multi-layered safety protection mechanism effectively prevents gas accidents.

[0099] In some embodiments, a second filter unit 12 is provided in the air supply duct 1.

[0100] In this invention, by setting a second filter unit 12 in the air supply duct 1, secondary purification of the airflow is achieved, and the air supply quality is further improved, resulting in the beneficial effects of multiple filtration protection and long-term performance maintenance. Building upon the primary filtration of outdoor air by the first filter unit 11, the second filter unit undertakes a more refined filtration task, removing residual fine particulate matter, organic pollutants, and odor molecules. The series configuration of the two-stage filtration achieves a progressive purification process from coarse to fine, ensuring that the air supply airflow reaches a higher cleanliness standard.

[0101] Specifically, the second filter unit 12 is typically installed in the middle or end of the air supply duct 1, where the airflow initially purified by the first filter unit 11 undergoes further fine filtration. The second filter unit can employ a HEPA high-efficiency filter, an activated carbon filter, or a composite filter to specifically treat different types of pollutants. HEPA filters can remove particles larger than 0.3μm with a filtration efficiency exceeding 99.97%; activated carbon filters adsorb organic gases and odor molecules, making them particularly suitable for treating harmful components in industrial pollution and traffic exhaust; composite filters combine the dual effects of mechanical filtration and chemical adsorption, achieving comprehensive treatment of various pollutants. The second filter unit also protects downstream equipment, reducing the possibility of contamination of the pressurization system 2 and the heating assembly 4.

[0102] In one specific embodiment, considering a heavily polluted urban environment, outdoor air contains high concentrations of PM2.5, NO2, and volatile organic compounds. After treatment by the first filtration unit 11, most of the coarse particulate matter is removed, but some fine particulate matter and gaseous pollutants remain. By incorporating a second filtration unit employing an activated carbon and HEPA composite filter, the PM2.5 concentration can be reduced from 25 μg / m³.3 Further reduced to 5 μg / m 3 Below, NO2 concentration is reduced by more than 80%, and VOCs concentration is reduced by more than 90%. This air curtain, formed by the double-filtered clean air, not only effectively blocks cooking fumes but also continuously improves kitchen air quality, providing cooks with a working environment close to cleanroom standards.

[0103] In another embodiment, the air curtain device can be used independently of the range hood and stove to provide clean air to the room as a fresh air system. Alternatively, the air curtain device can be activated at the same time as the fresh air supply to provide clean air with ions to the room.

[0104] like Figure 11 As shown, in one embodiment, when the base of the air outlet assembly 3 is provided with a movable bottom cover 35, one end of the movable bottom cover 35 is connected to the bottom of the air outlet assembly 3 by a hinge, and the other end can be locked by a buckle. By opening the movable bottom cover 35, it is convenient to clean the inside of the air outlet assembly 3.

[0105] Example 1: Normal Use of Lifting Air Curtain Device

[0106] This embodiment describes the working process of an air curtain device with a lifting mechanism in a normal cooking scenario.

[0107] When cooking is required, the user turns on the range hood or starts the stove (the range hood automatically starts via a linkage system). Simultaneously, the pressurization system activates, pressurizing the air in the ductwork before releasing it through the high-speed air outlets of the exhaust assembly, creating an air curtain between the stove and the range hood. During cooking, the control system automatically adjusts the operating parameters of the range hood and air curtain device based on the heat level and the detected smoke concentration, ensuring the flame operates normally while keeping the generated smoke within the air curtain area and effectively exhausting it by the range hood.

[0108] The specific intelligent adjustment process is as follows: When the flame is enhanced or high-heat cooking such as stir-frying causes an increase in oil fumes, the lifting mechanism drives the air outlet component to descend further, approaching the surface of the stove. At the same time, the pressurization system increases the power and increases the airflow, so that the directional airflow released by the high-speed air outlet forms a larger surrounding range, ensuring that the generated oil fumes are surrounded by the air curtain to the greatest extent and effectively discharged by the range hood.

[0109] During winter use, a temperature sensor detects the temperature of the fresh air in the air supply duct. When the temperature difference between indoors and outdoors exceeds the first set value (e.g., temperature difference > 15℃), the regulating valve automatically opens, allowing some airflow to enter the heating duct. The fresh air is preheated by the waste heat recovery unit in the heater before being mixed with the main airflow and discharged. The temperature of the fresh air after waste heat recovery is detected again by the temperature sensor. If the temperature difference with the indoor temperature is still greater than the second set value (e.g., temperature difference > 5℃), the controller controls the regulating valve to open fully, allowing all the fresh air in the air supply duct to enter the heater. If the temperature difference is still greater than the second set value, the electric heating unit in the heater is simultaneously activated based on waste heat recovery, ultimately ensuring that the airflow temperature discharged from the high-speed air outlet is suitable, making the cook feel comfortable, while minimizing heat loss in the kitchen.

[0110] Example 2: Normal Use of Desktop Air Curtain Device

[0111] This embodiment describes the operation of an air curtain device installed on a desktop during a normal cooking scenario.

[0112] The air outlet assembly is positioned on the tabletop and supports the cooktop, with high-speed air vents arranged around its perimeter. When the flame intensifies or high-heat cooking such as stir-frying increases the amount of fumes, the angle adjustment unit adjusts the airflow angle of each high-speed air vent, further opening the air outlet angle. Simultaneously, the pressurization system increases power and airflow, creating a larger enveloping area to ensure that the generated fumes are surrounded by an air curtain to the greatest extent possible and effectively exhausted by the range hood.

[0113] The hydraulic press has an oil fume monitoring unit that can detect the distribution and escape of oil fumes above the stove, and intelligently control the angle and flow rate of the four air outlets to minimize the escape of oil fumes. (For example, if only one side of the stove is usually turned on, the oil fumes will definitely be greater on the side that is lit, requiring a larger flow rate and a suitable air delivery angle).

[0114] The temperature control process is the same as in Example 1: the temperature sensor detects the temperature of the fresh air in the air supply duct. When the temperature difference between indoors and outdoors exceeds the set threshold, the airflow ratio entering the heating duct is controlled by the regulating valve. The waste heat utilization unit of the stove and the electric heating unit in the heater are used to heat the airflow to ensure that the airflow temperature discharged from the high-speed air outlet is suitable.

[0115] During normal use, users can remove the grille at the high-speed air outlet and the inspection port at the bottom of the air outlet as needed for cleaning and maintenance to ensure unobstructed and hygienic airflow.

[0116] Example 3: Safety Protection in Abnormal Situations

[0117] This embodiment describes the safety protection function of the air curtain device when abnormal situations such as gas leaks or excessive carbon monoxide are detected.

[0118] When the gas detection unit detects toxic gases such as carbon monoxide or gas around the range hood, the controller automatically starts the range hood and pressurization system based on the detection. When the concentration of toxic gases above the stove is higher than the ambient concentration, the pressurization system operates at maximum power. For lift-type air curtain devices, the lifting mechanism lowers the air outlet to the lowest position, with the air outlet pointing vertically upwards. For tabletop air curtain devices, the angle adjustment unit adjusts the air outlet angle to the minimum upward angle, working with the range hood to lock the space between the stove and the range hood area, quickly diluting and expelling toxic gases. At the same time, the controller issues an alarm signal (audio-visual alarm or remote mobile phone notification).

[0119] When the concentration of toxic gases detected around the kitchen is greater than or equal to the concentration above the stove, it indicates a potential serious situation such as a pipe leak in a sealed indoor environment. The controller prioritizes activating the range hood at high power to exhaust the gas. Simultaneously, the pressure detection unit monitors the negative pressure value of the range hood. When the negative pressure or suction power exceeds the set value, the booster system is activated at maximum power. For lift-type air curtain devices, the lifting mechanism lowers the air outlet components to their lowest position, and the air vents are horizontally rotated in all directions. For tabletop air curtain devices, the angle adjustment unit adjusts the air outlet angle to its maximum, ensuring that fresh air covers as much area as possible, achieving maximum ventilation and dilution.

[0120] During the aforementioned abnormal protection process, if the air curtain device is equipped with an ion generator, the ion generator will simultaneously activate to ionize the gas in the air supply duct, enhancing its ability to decompose harmful gases. The first and second filter units ensure the cleanliness of the introduced outdoor fresh air, preventing secondary pollution.

[0121] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications 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 this utility model.

Claims

1. A fresh air curtain device that can be used with a range hood, characterized in that, include: Air supply duct (1), the input end of which is located outdoors; A pressurization system (2) is installed in the air supply duct (1) for pressurizing and transporting the gas in the air supply duct (1); An air outlet assembly (3) is connected to the output end of the air supply duct (1). The air outlet assembly (3) is located on at least one side of the stove (7). The air outlet assembly (3) has a high-speed air outlet (31). The directional airflow delivered by the high-speed air outlet (31) forms an air curtain between the air outlet assembly (3) and the range hood (8), and the air curtain is used to block the spread of oil fumes generated at the stove (7).

2. The fresh air curtain device that can be used with a range hood according to claim 1, characterized in that, The air outlet assembly (3) has an angle adjustment unit, which is used to adjust the air delivery angle of the high-speed air outlet (31).

3. The fresh air curtain device that can be used with a range hood according to claim 1, characterized in that, The air outlet assembly (3) includes a variable cross-section air duct connected to the air supply duct (1), and the variable cross-section air duct includes a gradually expanding section and a gradually contracting section connected to the gradually expanding section.

4. The fresh air curtain device that can be used with a range hood according to claim 1, characterized in that, The air supply duct (1) is equipped with a first filter unit (11) at its input end.

5. The fresh air curtain device that can be used with a range hood according to claim 1, characterized in that, It also includes a heating component (4) that exchanges heat with at least a portion of the air supply duct (1) for heating the gas in the air supply duct (1).

6. The fresh air curtain device that can be used with a range hood according to claim 5, characterized in that, The heating component (4) includes: A heating pipe (41) is connected in parallel with the air supply pipe (1), and a regulating valve (42) is provided at the connection between the heating pipe (41) and the air supply pipe (1). The heater (43) exchanges heat with the heating pipe (41).

7. The fresh air curtain device that can be used with a range hood according to claim 6, characterized in that, The heater (43) includes the oil fume waste heat utilization unit of the range hood (8), the waste heat utilization unit of the stove (7), or the electric heating unit.

8. The fresh air curtain device for use with a range hood according to any one of claims 1-7, characterized in that, Also includes: Lifting mechanism (5), the lifting mechanism (5) is installed on the range hood (8), and the bottom lifting end of the lifting mechanism (5) is connected to the air outlet assembly (3); The air outlet assembly (3) includes a first state located on one side of the stove (7) and a second state housed inside the range hood (8). The lifting mechanism (5) is used to drive the air outlet assembly (3) to switch between the first state and the second state.

9. The fresh air curtain device that can be used with a range hood according to claim 8, characterized in that, The air outlet assembly (3) is rotatably connected to the bottom lifting end of the lifting mechanism (5) for switching between horizontal and vertical states.

10. The fresh air curtain device for use with a range hood according to any one of claims 1-7, characterized in that, The air outlet assembly (3) is set on the tabletop, the air outlet assembly (3) supports the stove (7), and a grille (32) is detachably installed at the high-speed air outlet (31).

11. The fresh air curtain device for use with a range hood according to claim 10, characterized in that, The height of the high-speed air outlet (31) is higher than that of the desktop.

12. The fresh air curtain device that can be used with a range hood according to claim 1, characterized in that, It also includes an ion generator (6), which is connected to the air supply duct (1) and is used to ionize the gas in the air supply duct (1).

13. The fresh air curtain device that can be used with a range hood according to claim 5, characterized in that, It also includes a control system (9), which includes: The first temperature sensor (91) is used to detect the gas temperature at the high-speed air outlet (31) or inside the air outlet assembly (3); A flow sensor (92) is used to detect the gas flow rate at the high-speed air outlet; The controller (93) is electrically or communicatively connected to the first temperature sensor (91), the flow sensor (92), the pressurization system (2) and the heating component (4), and is used to control the heating component (4) and the pressurization system (2) according to the gas temperature and flow rate.

14. The fresh air curtain device for use with a range hood according to claim 13, characterized in that, The control system (9) further includes: The second temperature sensor (96) is used to detect the temperature of the fresh air entering from the outside. The third temperature sensor (97) is used to detect the indoor ambient temperature; The second temperature sensor (96) and the third temperature sensor (97) are electrically or communicatively connected to the controller (93), respectively.

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