Range hood and control method thereof

Abstract

The embodiment of the invention discloses a range hood and a control method thereof, the range hood comprises an exhaust fume collecting hood and two turning plates, the two turning plates are arranged at a fume inlet of the exhaust fume collecting hood, the two turning plates can turn around the edges of the opposite sides and are telescopic, and the edges, close to each other, of the two turning plates form an opening. The control method comprises the following steps: determining the position of a central point of oil fume generated in a cooking process; according to the position of the central point of the oil smoke, the turning angle and / or the telescopic length of the two turning plates are / is adjusted in real time, so that the orientation and / or area of the opening are / is changed. According to the technical scheme provided by the embodiment of the invention, by adjusting the length and angle of the turning plate, the central area of the exhaust inlet can be always aligned with the oil fume source, so that the oil fume control effect of the range hood is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to kitchen appliance technology, and in particular to an extractor hood and a control method thereof. BACKGROUND

[0002] In a kitchen cooking scenario, the smoke gathering effect of an extractor hood directly affects the smoke exhaust efficiency and the cleanliness of the kitchen environment.

[0003] The current common extractor hood product mainly adjusts the fan speed of different regions or the whole to change the air volume distribution of the air inlet, so as to optimize the smoke gathering effect.

[0004] However, the mode of adjusting the air volume is difficult to accurately track the dynamic oil fume source. When the oil fume diffusion path deviates from the preset center area of the air inlet, it is difficult to overcome the efficiency decline caused by the increase of physical distance and airflow path deviation by simply increasing the air volume, and the improvement effect on the edge escape oil fume is limited. In addition, increasing the air volume will also increase the energy consumption and noise. SUMMARY

[0005] The present application provides an extractor hood and a control method thereof, which adjusts the length and angle of the flap to ensure that the center area of the air inlet is always aligned with the oil fume source, thereby improving the oil fume control effect of the extractor hood.

[0006] In a first aspect, embodiments of the present application provide a control method of an extractor hood, the extractor hood comprising a smoke collecting hood and two flaps, the two flaps being arranged at the smoke inlet of the smoke collecting hood, the two flaps being respectively rotatable about the side edges facing away from each other and being telescopic, the edges of the two flaps facing each other forming an opening.

[0007] The control method comprises: determining the position of the center point of the oil fume generated in the cooking process; and adjusting the rotation angle and / or telescopic length of the two flaps in real time according to the position of the center point of the oil fume, so as to change the orientation and / or area of the opening.

[0008] Optionally, determining the position of the center point of the oil fume generated in the cooking process comprises:

[0009] detecting the concentration distribution of the oil fume generated in the cooking process in real time;

[0010] determining the position of the point with the highest oil fume concentration according to the concentration distribution of the oil fume, and taking the point with the highest oil fume concentration as the center point of the oil fume.

[0011] Optionally, determining the position of the center point of the oil fume generated in the cooking process comprises:

[0012] determining a cooking recipe and / or a cooking appliance;

[0013] According to the cooking recipe and / or the cooking appliance, a corresponding pre-stored variation curve of the oil fume center point position and the cooking time is acquired;

[0014] During the cooking process, according to the real-time cooking time and the variation curve of the oil fume center point position and the cooking time, the center point position of the oil fume is determined.

[0015] Optionally, before the real-time adjustment of the turning angle and / or the telescopic length of the two turning plates according to the position of the center point of the oil fume to change the orientation and / or the area of the opening, it further comprises:

[0016] Detecting the transverse escape of the oil fume generated during the cooking process;

[0017] According to the position of the center point of the oil fume, the turning angle and / or the telescopic length of the two turning plates are adjusted in real time to change the orientation and / or the area of the opening, comprising:

[0018] According to the position of the center point of the oil fume and the transverse escape, the turning angle and / or the telescopic length of the two turning plates are adjusted in real time to change the orientation and / or the area of the opening.

[0019] Optionally, the two turning plates include a same-side turning plate and an opposite-side turning plate; the center point of the oil fume and the same-side turning plate are located in the same region, and the center point of the oil fume and the opposite-side turning plate are located in different regions in the two regions formed by the oil smoke exhaust device in the left-right direction;

[0020] According to the position of the center point of the oil fume and the transverse escape, the turning angle and / or the telescopic length of the two turning plates are adjusted in real time to change the orientation and / or the area of the opening, comprising:

[0021] When the center point of the oil fume does not move and the oil fume escapes transversely, the telescopic lengths of the opposite-side turning plate and the same-side turning plate are adjusted to make the opposite-side turning plate coplanar with the center point of the oil fume, the minimum distances of the center point of the oil fume from the edges of the same-side turning plate and the opposite-side turning plate are equal respectively, and the area of the opening formed by the same-side turning plate and the opposite-side turning plate is increased.

[0022] Optionally, the two turning plates include a same-side turning plate and an opposite-side turning plate; the center point of the oil fume and the same-side turning plate are located in the same region, and the center point of the oil fume and the opposite-side turning plate are located in different regions in the two regions formed by the oil smoke exhaust device in the left-right direction;

[0023] According to the position of the center point of the oil fume and the transverse escape, the turning angle and / or the telescopic length of the two turning plates are adjusted in real time to change the orientation and / or the area of the opening, comprising:

[0024] When the center point of the oil fume moves and the oil fume does not escape laterally, the opposite side flap is turned to be coplanar with the center point of the oil fume while keeping the opposite side flap in the maximum extension length state, and the turning angle and the extension length of the same side flap are adjusted so that the minimum distances from the center point of the oil fume to the edges of the same side flap and the opposite side flap are equal, respectively.

[0025] Optionally, the range hood is divided into a first region and a second region in the left-right direction; the two flaps include a first flap and a second flap, the first flap is located in the first region, and the second flap is located in the second region; the first region includes a first position point, and the second region includes a second position point;

[0026] When the center point of the oil fume moves and the oil fume does not escape laterally, the opposite side flap is turned to be coplanar with the center point of the oil fume while keeping the opposite side flap in the maximum extension length state, and the turning angle and the extension length of the same side flap are adjusted so that the minimum distances from the center point of the oil fume to the edges of the same side flap and the opposite side flap are equal, respectively.

[0027] When the center point of the oil fume moves from the first position point to the second position point and the oil fume does not escape laterally, the first flap and the second flap are adjusted from a first state to a second state; in the first state, the first flap is in the maximum extension length state, the first flap is coplanar with the center point of the oil fume, and the minimum distances from the center point of the oil fume to the edges of the first flap and the second flap are equal, respectively; in the second state, the second flap is in the maximum extension length state, the second flap is coplanar with the center point of the oil fume, and the minimum distances from the center point of the oil fume to the edges of the first flap and the second flap are equal, respectively.

[0028] Optionally, the two flaps include a same side flap and an opposite side flap; in the two regions formed by the range hood in the left-right direction, the center point of the oil fume is located in the same region as the same side flap and in a different region as the opposite side flap.

[0029] According to the position of the center point of the oil fume and the lateral escape condition, the turning angle and / or the extension length of the two flaps are adjusted in real time to change the orientation and / or the area of the opening, including:

[0030] When the center point of the oil fume moves longitudinally and the oil fume escapes laterally, the turning angle and the extension length of the opposite side flap and the same side flap are adjusted so that the opposite side flap is coplanar with the center point of the oil fume, the minimum distances from the center point of the oil fume to the edges of the same side flap and the opposite side flap are equal, respectively, and the area of the opening formed by the same side flap and the opposite side flap increases.

[0031] Optionally, after the turning angle and / or the extension length of the two flaps are adjusted in real time according to the position of the center point of the oil fume and the lateral escape condition to change the orientation and / or the area of the opening, the method further includes:

[0032] detecting a lateral escape of the oil fume generated during the cooking process;

[0033] stopping adjusting the turning angles and the telescopic lengths of the opposite turning plate and the same-side turning plate when the lateral escape of the oil fume does not occur;

[0034] adjusting the turning angles and the telescopic lengths of the opposite turning plate and the same-side turning plate so that the opposite turning plate is coplanar with the center point of the oil fume, the center point of the oil fume is equal to the minimum distance between the edge of the same-side turning plate and the edge of the opposite turning plate, and the opening formed by the same-side turning plate and the opposite turning plate changes in a direction perpendicular to the first center line after the area of the opening is increased to the maximum and the lateral escape of the oil fume occurs, wherein the first center line is a line connecting the center point of the oil fume and the center point of the oil inlet.

[0035] Optionally, after the turning angles and the telescopic lengths of the opposite turning plate and the same-side turning plate are adjusted so that the opposite turning plate is coplanar with the center point of the oil fume, the center point of the oil fume is equal to the minimum distance between the edge of the same-side turning plate and the edge of the opposite turning plate, and the opening formed by the same-side turning plate and the opposite turning plate changes in a direction perpendicular to the first center line after the area of the opening is increased to the maximum and the lateral escape of the oil fume occurs, the method further comprises:

[0036] detecting a lateral escape of the oil fume generated during the cooking process;

[0037] detecting the orientation of the opening;

[0038] stopping adjusting the turning angles and the telescopic lengths of the opposite turning plate and the same-side turning plate when the lateral escape of the oil fume does not occur;

[0039] increasing the power of the fan in the range hood when the lateral escape of the oil fume still occurs after the orientation of the opening is adjusted to be perpendicular to the first center line.

[0040] In a second aspect, the embodiments of the present application also provide a range hood, which comprises a smoke collecting cover and two turning plates, the two turning plates are arranged at an oil inlet of the smoke collecting cover, the two turning plates are respectively capable of turning around a side edge away from each other and are telescopic, and the edges of the two turning plates close to each other form an opening; the range hood is used to execute the control method of the range hood according to any one of the first aspect.

[0041] Optionally, the turning plate comprises a first plate body and a second plate body, the second plate body is embedded in the first plate body and is relatively slidable with the first plate body.

[0042] Optionally, the range hood further comprises a driving mechanism, the driving mechanism is mechanically connected with the two turning plates respectively and is used to drive the turning plates to turn.

[0043] Optionally, the range hood further comprises two rotating motors and two rotating shafts, the two rotating shafts are respectively fixedly connected to the side edges of the two flaps away from each other, and the rotating motors are in transmission connection with the rotating shafts to drive the rotating shafts and the flaps to turn over; and / or,

[0044] The range hood further comprises two fixed plates, the two fixed plates are respectively fixed below the smoke collecting cover and are respectively in rotational connection with the side edges of the two flaps away from each other, and the two fixed plates and the two flaps in the closed state are coplanar.

[0045] The range hood provided by the embodiment of the present application comprises a smoke collecting cover and two flaps, the two flaps are arranged at the smoke inlet of the smoke collecting cover, the two flaps are respectively turnable about the side edges away from each other and are respectively telescopic, and the edges of the two flaps close to each other form an opening. The control method comprises the following steps: determining the position of the center point of the oil fume generated in the cooking process, and then providing a target coordinate for the dynamic adjustment of the flaps to ensure that the adjustment direction is always around the core diffusion area of the oil fume. According to the position of the center point of the oil fume, the turning angle and / or the telescopic length of the two flaps are adjusted in real time to change the orientation and / or the area of the opening, so that the opening can adapt to the diffusion range and flow track of the oil fume to form a targeted negative pressure adsorption area. The technical solution provided by the embodiment of the present application can ensure that the center area of the air inlet is always aligned with the oil fume source by adjusting the length and angle of the flaps, and the oil fume control effect of the range hood is improved. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 A structural schematic diagram of a range hood provided by the embodiment of the present application is shown in the figure;

[0047] Figure 2 A structural schematic diagram of a range hood provided by the embodiment of the present application is shown in the figure;

[0048] Figure 3 A structural schematic diagram of another range hood provided by the embodiment of the present application is shown in the figure;

[0049] Figure 4 A flow chart of a control method of a range hood provided by the embodiment of the present application is shown in the figure;

[0050] Figure 5 A structural sectional view of a range hood provided by the embodiment of the present application is shown in the figure;

[0051] Figure 6 A structural sectional view of another range hood provided by the embodiment of the present application is shown in the figure;

[0052] Figure 7 A structural sectional view of another range hood provided by the embodiment of the present application is shown in the figure;

[0053] Figure 8Another flow chart of a control method of a range hood according to an embodiment of the present application is provided;

[0054] Figure 9 Another flow chart of a control method of a range hood according to an embodiment of the present application is provided;

[0055] Figure 10 Another flow chart of a control method of a range hood according to an embodiment of the present application is provided;

[0056] Figure 11 Another flow chart of a control method of a range hood according to an embodiment of the present application is provided;

[0057] Figure 12 Another flow chart of a control method of a range hood according to an embodiment of the present application is provided;

[0058] Figure 13 Another flow chart of a control method of a range hood according to an embodiment of the present application is provided;

[0059] In the drawings:

[0060] 1, hood; 2, flap; 201, first flap; 202, second flap; 21, first plate body; 22, second plate body; 23, rotary motor; 24, rotating shaft; 3, fixed plate. DETAILED DESCRIPTION

[0061] The present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be merely illustrative of the present application and not in limitation thereof. It should also be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings rather than all the parts.

[0062] The terms used in the embodiments of the present application are merely for the purpose of describing specific embodiments and are not intended to limit the present application. It should be noted that the terms "upper", "lower", "left", "right", and the like described in the embodiments of the present application are described in the angle shown in the drawings and should not be construed as limiting the embodiments of the present application. In addition, it should be understood in the context that when referring to one element being formed "on" or "under" another element, it can be directly formed "on" or "under" another element, or indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second", and the like are merely for the purpose of description and do not represent any order, quantity, or importance, but are used to distinguish different components. The specific meanings of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.

[0063] The term "include" and variations thereof, as used in the present disclosure, shall mean "to include, without limitation." The term "based on" means "based at least in part on." The term "one embodiment" means "at least one embodiment."

[0064] It should be noted that the terms "first", "second", and the like in the present disclosure are used only to distinguish corresponding content, and are not intended to limit the order or interdependence.

[0065] It should be noted that the modification of "one" or "multiple" in the present disclosure is illustrative and not restrictive, and those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0066] Figure 1 A structure diagram of a range hood is provided for an embodiment of the present application, Figure 2 A structure diagram of a range hood is provided for an embodiment of the present application, Figure 3 Another structure diagram of a range hood is provided for an embodiment of the present application. As shown in the figure, Figures 1-3 The range hood includes a smoke collecting hood 1 and two flaps 2, the two flaps 2 are arranged at the smoke inlet of the smoke collecting hood 1, and the two flaps 2 can be flipped around the side edges away from each other and can be extended and retracted, and the edges of the two flaps 2 close to each other form an opening.

[0067] Specifically, during the working process of the range hood, as shown in the figure, Figure 1 When the range hood is not started or in standby state, the two flaps 2 are in the retracted state. At this time, the smoke inlet is in the closed state. As shown in the figure, Figure 2 When the user starts cooking and starts the range hood, the two flaps 2 of the range hood will be flipped according to the initial position of the pot or the preset initial position, so that the opening formed by the inner edges of the two flaps 2 close to each other can preliminarily align with the center point of the smoke generated by the lower cooking appliance. At the same time, the flaps 2 are extended and retracted to adjust the range of the smoke inlet and the size of the opening formed thereby to adapt to the real-time change of the amount of smoke or the size of the cooking appliance.

[0068] In an alternative embodiment, a plurality of sensors such as smoke sensors, image sensors or temperature sensors are arranged near the range hood or the cooking appliance. According to the center point of the smoke detected by the above-mentioned sensors, the flaps 2 are controlled to adjust the flipping angle and the extension length, so that the opening formed by the flaps 2 always tracks the core position of the current smoke generation, and ensures that the strongest suction force acts on the source of the smoke generation.

[0069] Continuing to refer to Figure 3In an optional embodiment, the turning plate 2 comprises a first plate body 21 and a second plate body 22, the second plate body 22 is embedded in the first plate body 21 and is relatively slidable with the first plate body 21.

[0070] Specifically, the first plate body 21 is internally provided with a sliding groove and an extension device matched with the second plate body 22, the second plate body 22 is slidable in the sliding groove. When it is needed to adjust the length of the turning plate 2, the second plate body 22 can be extended or retracted relative to the first plate body 21, so as to realize the extension of the turning plate 2.

[0071] For example, when the cooking produces a large amount of oil fume and it is needed to reduce the range of the fume collection, the second plate body 22 is slid out of the first plate body 21, so as to increase the overall length of the turning plate 2; and when it is needed to increase the range of the fume collection, the second plate body 22 is retracted into the first plate body 21, so as to reduce the length of the turning plate 2. It should be understood that other structures capable of realizing the extension can also achieve the purpose of the present application, which is only an optional embodiment, and the present application does not limit this.

[0072] In the embodiment of the present application, the extractor hood further comprises a driving mechanism, the driving mechanism is mechanically connected with the two turning plates 2 respectively, and is used for driving the turning plates 2 to turn over. The specific form of the driving mechanism is not limited in the embodiment of the present application, and the embodiment of the present application will be described in detail below with reference to Figure 3 In an optional embodiment, the driving mechanism can comprise two rotary motors 23 and two rotating shafts 24, the side edges of the two turning plates 2 away from each other are respectively fixedly connected with one rotating shaft 23, and the rotary motor 23 is in transmission connection with the rotating shaft 24, so as to drive the rotating shaft 23 and the turning plate 2 to turn over.

[0073] Specifically, the rotary motor 23 is in transmission connection with the rotating shaft 24, and the rotating shaft 24 will drive the turning plate 2 to turn over around the axis of the rotating shaft 24 under the action of the rotary motor 23. The turning direction and the inclination angle of the turning plate 2 are adjusted by controlling the forward and reverse rotation and the rotation angle of the rotary motor 23, so as to adapt to the fume collection demand in different cooking scenes. It should be understood that other structures capable of realizing the turning can also achieve the purpose of the present application, which is only an optional embodiment, and the present application does not limit this.

[0074] Continuing to refer to Figure 3 In an optional embodiment, the extractor hood further comprises two fixed plates 3; the two fixed plates 3 are respectively fixed below the smoke collecting cover 1 and are respectively in rotational connection with the side edges of the two turning plates 2 away from each other; the two fixed plates 3 and the two turning plates 2 in the closed state are coplanar.

[0075] Specifically, the fixed plates 3 are fixedly connected with the smoke hoods 1 by means of bolts, buckles or welding, etc. The fixed plates 3 are used to provide support for the turning plates 2. Two fixed plates 3 are respectively located at two side positions below the smoke hoods, and are rotationally connected with side edges of the turning plates 2 which are away from each other, so that the turning plates 2 can be flipped with the connecting points with the fixed plates 3 as the shaft. When the turning plates 2 are in the closed state, surfaces of the two fixed plates 3 and the two turning plates 2 are in the same plane.

[0076] For the range hood of the above-mentioned embodiment, the embodiment of the present application further provides a control method of the range hood. Figure 4 A flow chart of a control method of a range hood provided by the embodiment of the present application, Figure 5 A structure sectional view of a range hood provided by the embodiment of the present application, Figure 6 Another structure sectional view of a range hood provided by the embodiment of the present application, Figure 7 Still another structure sectional view of a range hood provided by the embodiment of the present application. In the figure, the x direction is a horizontal transverse direction, the y direction is a horizontal longitudinal direction perpendicular to the x direction, and the two directions form a vertical plane coordinate system. Point O is the projection of the center position of the smoke hood on the plane of the coordinate system. Based on this, the area covered by -xOy is the first area, and the area covered by xOy is the second area. Point A is the projection of the connecting line of the first turning plate 201 and the fixed plate 3 on the plane of the coordinate system; point B is the projection of the connecting line of the side of the first turning plate 201 closest to the second turning plate 202; point C is the projection of the connecting line of the second turning plate 202 and the fixed plate 3; point D is the projection of the connecting line of the side of the second turning plate 202 closest to the first turning plate 201; and point E is the projection of the assumed smoke center on the plane of the coordinate system. Point E' is the projection of the moved smoke center on the plane of the coordinate system, point B' is the adjusted projection position of point B, and point D' is the adjusted projection position of point D.

[0077] Reference Figures 1-7 The control method comprises:

[0078] S110, determining the position of the center point of the oil fume generated in the cooking process.

[0079] Specifically, the oil fume distribution data is acquired by a sensor, and the center point coordinates are determined after algorithm analysis. The center point can be understood as the gathering point or the point with the highest concentration of the oil fume.

[0080] Illustratively, the cooking area can be monitored in real time by combining image recognition technology, the oil fume contour is recognized through color contrast change, the spatial concentration data is acquired by using a smoke sensor, and finally the center point E of the oil fume is calculated by a Kalman filtering algorithm.

[0081] S120, adjust the turning angle and / or telescopic length of the two flaps in real time according to the position of the center point of the oil fume, so as to change the orientation and / or area of the opening.

[0082] Specifically, when the position E of the center point of the oil fume is detected to move, the turning angle and / or telescopic length of the two flaps 2 are adjusted in real time. It is ensured that the position E of the center point of the oil fume is always on the perpendicular bisector of the opening BD.

[0083] For example, referring to Figure 5 When the amount of oil fume increases, causing the position E of the center point of the oil fume to move along the y direction to reach E', the length of the flaps 2 is increased or the opening angle of the flaps 2 is decreased, so as to reduce the size of the opening, increase the wind pressure, and guide more oil fume flow into the smoke collecting hood 1. Conversely, referring to Figure 6 When the amount of oil fume decreases, the position E of the center point of the oil fume drops, and the flaps 2 can be shortened to increase the inlet range and cover a wider area.

[0084] For example, referring to Figure 7 When the position E of the center point of the oil fume moves to E', by moving the end positions of the two flaps 2 to B' and D', it is ensured that E' is located on the perpendicular bisector of B'D', so as to ensure that the inlet direction of the range hood is always opposite to the gathering point or the highest concentration point of the oil fume.

[0085] The embodiment of the present application provides a control method of a range hood, which comprises: determining the position of the center point of oil fume generated in a cooking process, and then providing target coordinates for dynamic adjustment of flaps, so as to ensure that the adjustment direction always surrounds the core diffusion area of the oil fume. According to the position of the center point of the oil fume, the turning angle and / or telescopic length of the two flaps are adjusted in real time, so as to change the orientation and / or area of the opening, and then the opening can adapt to the diffusion range and flow trajectory of the oil fume, and form a targeted negative pressure adsorption area. The technical scheme provided by the embodiment of the present application ensures that the center area of the inlet is always aligned with the oil fume source by adjusting the length and angle of the flaps, and improves the oil fume control effect of the range hood.

[0086] Figure 8 is a flow chart of another control method of a range hood provided by the embodiment of the present application, referring to Figure 8 , for the above-mentioned embodiment and the range hood. "S110, determining the position of the center point of oil fume generated in a cooking process", can be specifically refined as: detecting the concentration distribution of the oil fume generated in the cooking process in real time.

[0087] According to the concentration distribution of the oil fume, the position of the highest concentration point of the oil fume is determined, and the highest concentration point of the oil fume is taken as the center point of the oil fume.

[0088] The details of the present embodiment have been described in the previous embodiment.

[0089] As Figure 8 shown, another control method of the range hood provided by the embodiment of the application can include the following specific steps:

[0090] S210, real-time detection of the concentration distribution of the oil fume generated in the cooking process.

[0091] The concentration distribution of the oil fume can be understood as a three-dimensional space concentration field data constructed by a multi-sensor network, which not only contains the concentration value of the oil fume particles in a unit volume, but also includes the distribution position of these concentration values in the space above the cooking area.

[0092] Specifically, the image recognition technology or infrared sensor is used to monitor the cooking area in real time, and the peak point of the oil fume concentration distribution is analyzed as the center point position.

[0093] For example, the camera installed at the bottom of the range hood captures the oil fume image, and the image processing algorithm calculates the area with the highest gray value as the oil fume center point; or the array infrared sensor detects the temperature change at different positions, and the area with the strongest heat radiation is the oil fume concentration area.

[0094] For example, by deploying an array of smoke sensors at the bottom of the range hood, the edge of the cooking area, and above the table, each sensor synchronously collects data and uploads it to the processor. Based on the spatial coordinates of the sensors and the real-time concentration value, the processor generates a three-dimensional thermal map of the oil fume concentration, presenting the diffusion pattern of the oil fume in space. Further used to determine the oil fume center point in the subsequent steps, and identify the oil fume escape risk area, providing data support for dynamically adjusting the length / angle of the flap 2.

[0095] S220, determining the position of the point with the highest oil fume concentration based on the concentration distribution of the oil fume, and taking the point with the highest oil fume concentration as the center point of the oil fume.

[0096] Specifically, by analyzing the concentration distribution collected by the sensors, the sensor data with the highest concentration value and its coordinates are selected by comparison. If there are multiple same highest concentrations, the geometric center point of these coordinates is taken as the point with the highest oil fume concentration, and is marked as the center point of the oil fume. This provides a basis for the subsequent flap to accurately adjust the length / angle of the flap 2 with the center point, ensuring that the air inlet channel of the range hood can efficiently cover the core area of the oil fume diffusion.

[0097] S230, real-time adjustment of the turning angle and / or telescopic length of the two flaps according to the position of the center point of the oil fume, so as to change the orientation and / or area of the opening.

[0098] The control method of the range hood provided in the embodiment of the present application refines the logic of oil fume space distribution detection and center point positioning on the basis of the above-mentioned embodiment, and improves the adaptive ability of the range hood to different cooking scenes.

[0099] Figure 9 is a flowchart of another control method of a range hood provided in the embodiment of the present application, referring to Figure 9 , for the above-mentioned embodiment and the range hood. The "S110, determining the position of the center point of the oil fume generated in the cooking process" can be specifically refined as:

[0100] determining the cooking recipe and / or the cooking utensil;

[0101] acquiring the corresponding pre-stored change curve of the oil fume center point position and the cooking time according to the cooking recipe and / or the cooking utensil;

[0102] determining the position of the center point of the oil fume according to the real-time cooking time and the change curve of the oil fume center point position and the cooking time in the cooking process.

[0103] The details of the present embodiment not yet described can refer to the previous embodiment.

[0104] As shown in Figure 9 , the control method of the range hood provided in the embodiment of the present application can include the following specific steps:

[0105] S310, determining the cooking recipe and / or the cooking utensil.

[0106] Specifically, the cooking recipe refers to a standardized cooking scheme containing information such as food materials, seasonings, cooking steps and time, such as stir-frying green vegetables, braised spare ribs, etc. The cooking utensil refers to a cooking utensil such as a flat-bottomed pot, a frying pan, a soup pot, etc. The cooking recipe, pot type information, etc. input by the user can be received through an interactive component adapted to the range hood, such as a touch screen, a knob, a physical button, or an associated intelligent terminal such as a mobile phone APP, a voice assistant, etc.

[0107] S320, acquiring the corresponding pre-stored change curve of the oil fume center point position and the cooking time according to the cooking recipe and / or the cooking utensil.

[0108] The change curve of the oil fume center point position and the cooking time can be understood as a trajectory record of the position of the center point of the oil fume at different cooking time points when cooking with a specific cooking recipe and / or using a specific cooking utensil. The curve can be obtained through a large number of pre-experiments and built into the range hood.

[0109] Specifically, different cooking recipes have different cooking processes, for example, the oil fume is concentrated and the position changes rapidly with the action of stir-frying, and the oil fume is less and the position is relatively fixed when stewing; different cooking utensils will also cause differences in the change of the oil fume center point position with time due to different shapes, sizes and oil fume diffusion laws when heating. According to the determined cooking recipe and / or cooking utensil, the range hood retrieves the change curve matched therewith from the pre-stored database.

[0110] S330, in the cooking process, the center point position of the oil fume is determined according to the real-time cooking time and the change curve of the center point position of the oil fume and the cooking time.

[0111] The real-time cooking time can be understood as the time elapsed from the start of cooking to the current time.

[0112] Specifically, the time elapsed from the start of cooking to the current time is recorded in real time by a timing module built in the range hood. The real-time cooking time is corresponded to the change curve in the pre-stored database to find the oil fume center point position corresponding to the time point, so as to determine the center position of the oil fume generated at the current time.

[0113] S340, according to the position of the center point of the oil fume, the turning angle and / or the telescopic length of the two flaps are adjusted in real time to change the orientation and / or area of the opening.

[0114] The control method of the range hood provided by the embodiment of the application refines the way of determining the center point position of the oil fume on the basis of the above-mentioned embodiment, provides a basis for subsequent adjustment of the flap parameters of the range hood, and further improves the smoke suction efficiency of the range hood and the user's use experience.

[0115] Figure 10 is a flow chart of another control method of a range hood provided by the embodiment of the application, which is described with reference to Figure 10 , for the above-mentioned embodiment and the range hood. Before "S120, the turning angle and / or the telescopic length of the two flaps are adjusted in real time according to the position of the center point of the oil fume to change the orientation and / or area of the opening", it further includes:

[0116] detecting the transverse escape of the oil fume generated in the cooking process;

[0117] According to the position of the center point of the oil fume, the turning angle and / or the telescopic length of the two flaps are adjusted in real time to change the orientation and / or area of the opening.

[0118] According to the position of the center point of the oil fume and the transverse escape, the turning angle and / or the telescopic length of the two flaps are adjusted in real time to change the orientation and / or area of the opening.

[0119] The details of this embodiment have been described in the previous embodiment.

[0120] As Figure 10 shown, the control method of the range hood provided by the embodiment of the application can include the following specific steps:

[0121] S410, determining the position of the center point of the oil fume generated in the cooking process.

[0122] Specifically, the cooking area is monitored in real time by image recognition technology or a smoke sensor, and the peak point of the oil fume concentration distribution is analyzed as the center point position.

[0123] S420, detecting the lateral escape of the oil fume generated in the cooking process.

[0124] Specifically, when the lateral width of the oil fume exceeds a threshold value, it is determined that lateral escape occurs.

[0125] S430, adjusting the turning angle and / or telescopic length of the two flaps in real time according to the position of the center point of the oil fume and the lateral escape, so as to change the orientation and / or area of the opening.

[0126] Specifically, continuing to refer to Figure 6 , when the lateral escape occurs, the opening area is increased under the premise that the median line passes through the center point. That is, the opening orientation is aligned with the center point, and the opening area is increased to avoid the effect of the small opening gathering smoke, which is diffused to both sides until it is no longer diffused.

[0127] The control method of the range hood provided by the embodiment of the application, on the basis of the above-mentioned embodiment, increases the lateral escape detection, improves the side suction effect in the high-escape scene such as stir-frying and frying, and further improves the smoke suction efficiency of the range hood and the user's use experience.

[0128] Figure 11 is a flowchart of another control method of the range hood provided by the embodiment of the application, referring to Figure 11 , for the above-mentioned embodiment and the range hood, the two flaps 2 include the same-side flap and the opposite-side flap; in the two regions formed by the range hood in the left-right direction, the center point of the oil fume is located in the same region as the same-side flap and in a different region from the opposite-side flap. "S430, adjusting the turning angle and / or telescopic length of the two flaps 2 in real time according to the position of the center point of the oil fume and the lateral escape, so as to change the orientation and / or area of the opening", which can be further detailed as:

[0129] When the center point of the oil fume does not move and the oil fume escapes laterally, the extension lengths of the opposite turning plate and the same turning plate are adjusted so that the opposite turning plate is coplanar with the center point of the oil fume, the minimum distances of the center point of the oil fume to the edges of the same turning plate and the opposite turning plate are equal, and the area of the opening formed by the same turning plate and the opposite turning plate is increased.

[0130] The details of the present embodiment are not described in detail herein and can refer to the previous embodiment.

[0131] As shown in Figure 11 Another control method of the range hood provided by the embodiment of the present application can include the following specific steps:

[0132] S510, determining the position of the center point of the oil fume generated in the cooking process.

[0133] S520, detecting the lateral escape of the oil fume generated in the cooking process.

[0134] S530, when the center point of the oil fume does not move and the oil fume escapes laterally, the extension lengths of the opposite turning plate and the same turning plate are adjusted so that the opposite turning plate is coplanar with the center point of the oil fume, the minimum distances of the center point of the oil fume to the edges of the same turning plate and the opposite turning plate are equal, and the area of the opening formed by the same turning plate and the opposite turning plate is increased.

[0135] Wherein, if the center point of the oil fume is closer to the connecting line of the turning plate 2 and the fixed plate 3, the side is the same side, and the other side is the opposite side. For example, referring to Figure 7 When the center point of the oil fume E' is closer to point A, plate AB is the same turning plate, and plate CD is the opposite turning plate.

[0136] Specifically, referring to Figure 6 When it is monitored that the center point of the oil fume does not move but escapes laterally, the control system keeps the angle of the turning plate 2 unchanged and only adjusts the extension lengths of the opposite turning plate and the same turning plate. First, the same side and the opposite side are determined according to the distances of the center point of the oil fume to the connecting points of the two turning plates 2. At this time, the extension length of the opposite turning plate is adjusted so that the end of the opposite turning plate is coplanar with the center point of the oil fume, and the extension length of the same turning plate is adjusted synchronously to ensure that the area of the opening formed by the same turning plate and the opposite turning plate is increased, and the minimum distances of the center point of the oil fume to the edges of the same turning plate and the opposite turning plate are equal.

[0137] For example, continuing to refer to Figure 6 Based on the center point of the oil fume, the distance differences of the center point of the oil fume to the initial edges of the two turning plates 2 are calculated, the opposite turning plate is driven to extend along the axial direction by rotating the motor 23, and the end of the opposite turning plate is coplanar with the center point of the oil fume. At the same time, the same turning plate is synchronously extended according to the preset proportional relationship, so that the opening area is expanded to B'D'.

[0138] The control method of the range hood provided in the embodiment of the present application further refines the flap control method during lateral escape, reduces the lateral escape of the oil fume, and further improves the smoke suction efficiency of the range hood and the use experience of the user.

[0139] Figure 12 is a flowchart of another control method of a range hood provided in the embodiment of the present application, referring to Figure 12 , for the above-mentioned embodiment and the range hood, the two flaps 2 include a same-side flap and an opposite-side flap; in the two regions formed by the range hood in the left-right direction, the center point of the oil fume is located in the same region as the same-side flap and in a different region as the opposite-side flap. "S430, adjusting the turning angle and / or the telescopic length of the two flaps in real time according to the position of the center point of the oil fume and the lateral escape condition to change the orientation and / or the area of the opening", which can be refined as:

[0140] when the center point of the oil fume moves and the oil fume does not escape laterally, the opposite-side flap is turned to be coplanar with the center point of the oil fume while keeping the opposite-side flap in the maximum telescopic length state, and the turning angle and the telescopic length of the same-side flap are adjusted to make the minimum distances from the center point of the oil fume to the edges of the same-side flap and the opposite-side flap equal.

[0141] The details of the present embodiment not yet described can refer to the previous embodiment.

[0142] As shown in Figure 12 , another control method of a range hood provided in the embodiment of the present application can include the following specific steps:

[0143] S610, determining the position of the center point of the oil fume generated in the cooking process.

[0144] S620, detecting the lateral escape condition of the oil fume generated in the cooking process.

[0145] S630, when the center point of the oil fume moves and the oil fume does not escape laterally, the opposite-side flap is turned to be coplanar with the center point of the oil fume while keeping the opposite-side flap in the maximum telescopic length state, and the turning angle and the telescopic length of the same-side flap are adjusted to make the minimum distances from the center point of the oil fume to the edges of the same-side flap and the opposite-side flap equal.

[0146] Specifically, referring to Figure 7 , the oil fume center point E' is closer to point A, then the plate AB is the same-side flap and the plate CD is the opposite-side flap. At this time, the opposite-side flap CD' is turned to be coplanar with the center point E' of the oil fume while keeping the opposite-side flap CD' in the maximum telescopic length state, and the telescopic length of the same-side flap AB' is adjusted synchronously to ensure that the minimum distances from the oil fume center point E' to the edges B' of the same-side flap and the edges D' of the opposite-side flap are equal.

[0147] In a specific embodiment, with continuous reference to Figure 7 , in order to ensure that the minimum distance from the center point E' of the oil fume to the same side flap edge B' and the opposite side flap edge D' is equal, a first circle is made with D' as the center and the length of E'D' as the radius, at this time the opposite side flap edge B' needs to be located on the circumference. On this basis, the distance between E' and the range hood along the second direction determines the opening area formed by the same side flap and the opposite side flap, that is, the length of B'D'. If the movement is a horizontal movement, the vertical distance between the center point E' after the movement and the range hood is the same as that of E', then B'D' = BD, a second circle should be made with D' as the center and the length of BD as the radius, and the intersection point of the first circle and the second circle is the ideal position of the same side flap edge. If longitudinal movement is considered, with reference to the figure, a second circle should be made with D' as the center and the length of B'D' as the radius, and the intersection point of the first circle and the second circle is the ideal position of the same side flap edge. Among them, the length of B'D' is determined according to the vertical distance between the center point E' after the movement and the range hood.

[0148] The control method of the range hood provided by the embodiment of the present application refines the flap control method when the center point of the oil fume moves and the oil fume does not escape horizontally on the basis of the above-mentioned embodiment, accurately tracks the movement of the center of the oil fume, and further improves the smoke suction efficiency of the range hood and the user's use experience.

[0149] In an optional embodiment, with reference to Figure 1 and Figure 2 , for the above-mentioned embodiment and the range hood, the range hood is divided into a first area and a second area in the left-right direction; the two flaps include a first flap 201 and a second flap 202, the first flap 201 is located in the first area, and the second flap 202 is located in the second area; the first area includes a first position point, and the second area includes a second position point.

[0150] When the center point of the oil fume moves and the oil fume does not escape horizontally, the opposite side flap is turned to be coplanar with the center point of the oil fume while keeping the opposite side flap in the maximum extension length state, and the turning angle and the extension length of the same side flap are adjusted so that the minimum distance from the center point of the oil fume to the same side flap edge and the opposite side flap edge is equal, which can be refined as follows:

[0151] When the center point of the oil fume moves from the first position point to the second position point and the oil fume does not escape horizontally, the first flap and the second flap are controlled to be adjusted from the first state to the second state.

[0152] In the first state, the first flap 201 is in the maximum extension state, the first flap 201 is coplanar with the center point of the oil fume, and the minimum distance between the center point of the oil fume and the edges of the first flap 201 and the second flap 202 is equal.

[0153] Specifically, with reference to Figure 7 When the center point of the oil fume moves from the first position point E to the second position point E' without lateral escape, the first flap 201 and the second flap 202 need to be switched from the first state to the second state. Initially, the first flap 201 is in the maximum extension state, and its edge D is coplanar with the center point E of the oil fume, and the distance from the center point E to the edges D and B of the first and second flaps is equal. After the center point moves laterally to E', the system keeps the maximum extension state of the first flap 201 as C'D' on the opposite side, and adjusts the angle and extension amount of the second flap 202 as the same side flap. To ensure that the distance from the second position point E' to the edges of the two flaps is equal, a circle is drawn with E' as the center and E'D' as the radius, and according to the preset rule of the opening area, the lateral movement does not change the vertical distance between the center point and the range hood. Another circle is drawn with D' as the center and the original opening length BD as the radius. The intersection of the two circles is the ideal position of the second flap edge B'. E'B' = E'D' and the opening area B'D' = BD, so as to complete the state switching.

[0154] In an optional embodiment, the two flaps 2 include same side flaps and opposite side flaps; in the two regions formed by the range hood in the left-right direction, the center point of the oil fume is located in the same region as the same side flaps and in a different region as the opposite side flaps.

[0155] According to the position of the center point of the oil fume and the lateral escape, the turning angle and / or extension length of the two flaps are adjusted in real time to change the orientation and / or area of the opening, which can be specifically refined as:

[0156] When the center point of the oil fume moves longitudinally and the oil fume escapes laterally, the turning angle and extension length of the opposite side flaps and the same side flaps are adjusted so that the opposite side flaps are coplanar with the center point of the oil fume, the minimum distance between the center point of the oil fume and the edges of the same side flaps and the opposite side flaps is equal, and the area of the opening formed by the same side flaps and the opposite side flaps is increased.

[0157] Specifically, with reference to Figure 5When the oil fume center point E moves to E' in the longitudinal direction, since the oil fume center is in the middle position at this time, both sides of the turning plate can be used as the same side or opposite side turning plate. Taking the opposite side turning plate CD as an example, the end D of the opposite side turning plate needs to be moved to D' to be coplanar with the oil fume center point E'. In order to ensure that the minimum distances of the oil fume center point E' to the edge D' of the same side turning plate and the edge B' of the opposite side turning plate are equal, a first circle is drawn with D' as the center and the length of E'D' as the radius, at this time, the edge B' of the opposite side turning plate needs to be located on the circumference of the circle. On this basis, the distance between E' and the range hood in the second direction determines the opening area l1 formed by the same side turning plate and the opposite side turning plate. If only the longitudinal movement is considered, a second circle is drawn with D' as the center and l1 as the radius, and the intersection of the first circle and the second circle is the ideal position of the edge of the same side turning plate. However, due to the existence of lateral escape, the opening area needs to be increased according to the preset rule, and a second circle is drawn with l1+l2 as the radius, where l2 is the length that needs to be additionally increased due to the lateral escape. At this time, the intersection of the two circles is the final position of the edge of the same side turning plate, so as to ensure the centering effect while effectively expanding the opening area to suppress the spread of oil fumes.

[0158] Figure 13 is a flow chart of another control method of the range hood provided by the embodiment of the present application, referring to Figure 13 , for the above-mentioned embodiment and the range hood, after "S430, adjusting the turning angle and / or telescopic length of the two turning plates in real time according to the position of the center point of the oil fume and the lateral escape condition to change the orientation and / or area of the opening", it further includes:

[0159] measuring the lateral escape condition of the oil fume generated in the cooking process;

[0160] stopping adjusting the opposite side turning plate and the same side turning plate when the oil fume does not occur lateral escape;

[0161] when the area of the opening is increased to the maximum and the oil fume occurs lateral escape, adjusting the turning angle and telescopic length of the opposite side turning plate and the same side turning plate, so that the opposite side turning plate is coplanar with the center point of the oil fume, the minimum distances of the center point of the oil fume to the edge of the same side turning plate and the edge of the opposite side turning plate are equal, and the opening formed by the same side turning plate and the opposite side turning plate changes to the direction perpendicular to the first center line; wherein the first center line is the line connecting the center point of the oil fume and the center point of the smoke inlet.

[0162] The details of the present embodiment not yet described can refer to the previous embodiment.

[0163] As shown in Figure 13 , the control method of the range hood provided by the embodiment of the present application can include the following specific steps:

[0164] S710, determining the position of the center point of the oil fume generated in the cooking process.

[0165] S720, detecting the lateral escape of the oil fume generated in the cooking process.

[0166] S730, adjusting the turning angle and / or telescopic length of the two flaps in real time according to the position of the center point of the oil fume and the lateral escape, so as to change the orientation and / or area of the opening.

[0167] S740, detecting the lateral escape of the oil fume generated in the cooking process.

[0168] Specifically, after adjusting the turning angle and telescopic length of the flaps 2, it is monitored again whether the oil fume breaks through the preset lateral escape boundary, to verify whether there is still escape phenomenon after the escape correction.

[0169] S750, stopping adjusting the opposite flaps and the same side flaps when the oil fume does not occur lateral escape.

[0170] Specifically, when the detection result shows that the oil fume does not break through the lateral escape boundary, it indicates that the current angle and telescopic length of the flaps 2 can effectively capture the oil fume, and the control system will stop sending adjustment instructions to the rotating motor 23 driving the flaps 2, to maintain the current state of the opposite flaps and the same side flaps, so as to stabilize the smoke gathering and suction effect of the range hood, and avoid unnecessary energy consumption.

[0171] S760, when the area of the opening is increased to the maximum and the oil fume occurs lateral escape, adjusting the turning angle and telescopic length of the opposite flaps and the same side flaps, so that the opposite flaps are coplanar with the center point of the oil fume, the center point of the oil fume is equal to the minimum distance from the edge of the same side flaps and the edge of the opposite flaps, and the opening formed by the same side flaps and the opposite flaps changes to the direction perpendicular to the first center line.

[0172] Wherein, the first center line refers to the line connecting the center point of the oil fume and the center point of the smoke inlet of the range hood, and the direction perpendicular to the line is the horizontal direction perpendicular to the above-mentioned line. As shown in Figure 5 the first center line is the straight line OE.

[0173] Specifically, when it is detected that the oil fume still occurs lateral escape, and at this time the telescopic length of the same side flaps and the opposite flaps has reached the maximum state limited by the mechanical structure, that is, the opening area cannot be further increased, the opening orientation adjustment mechanism is started. When adjusting, first, the opposite flaps are kept coplanar with the center point of the oil fume, and the minimum distance from the center point of the oil fume to the edge of the same side flaps and the edge of the opposite flaps is ensured to be equal; then, the angles of the two flaps are turned synchronously, so that the opening as a whole is deflected to the direction perpendicular to the first center line, to change the airflow direction of the smoke gathering and enhance the capturing ability of the escaped oil fume to further suppress the lateral escape.

[0174] In a specific embodiment, with reference toFigure 7 When the positions of the flaps 2 have been adjusted from AB to AB', CD to CD', but the lateral escape of the oil fume is still monitored, the angle ∠OAB' formed by the same-side flap AB' and the connecting point O will be increased, and the angle ∠OCD' formed by the opposite-side flap CD' and the connecting point O will be decreased, and the two angles are made as equal as possible through real-time calibration, i.e., ∠OAB'≈∠OCD'. The angle of the first center line is optimized to be closer to the state of being perpendicular to the plane of the range hood air inlet, thereby enhancing the directional adsorption of the air inlet to the oil fume.

[0175] The control method of the range hood provided by the embodiment of the present application supplements the coping strategy for the problem of lateral escape of oil fume that cannot be completely solved by simply expanding the opening area, further reduces the amount of oil fume that escapes laterally by improving airflow guidance, improves the smoke absorption efficiency of the range hood in complex cooking scenarios, and enhances the clean experience of the user during use.

[0176] In an optional embodiment, when the oil fume escapes laterally after the area of the opening is maximized, the turning angles and the telescopic lengths of the opposite-side flap and the same-side flap are adjusted so that the opposite-side flap is coplanar with the center point of the oil fume, the center point of the oil fume is equal in distance to the edge of the same-side flap and the edge of the opposite-side flap, and the opening formed by the same-side flap and the opposite-side flap changes in direction perpendicular to the first center line, and the method further comprises: detecting the lateral escape of the oil fume generated during cooking; detecting the direction of the opening; stopping adjusting the turning angles and the telescopic lengths of the opposite-side flap and the same-side flap when the oil fume does not escape laterally; and increasing the power of the fan in the range hood when the oil fume still escapes laterally after the direction of the opening is adjusted to be perpendicular to the first center line.

[0177] Specifically, after the adjustment of the direction of the opening is completed, the lateral escape of the oil fume is detected again. If the detection result shows that the oil fume no longer escapes laterally, it indicates that the current turning angles and the telescopic lengths of the flaps can effectively capture the oil fume, and at this time, the adjustment of the turning angles and the telescopic lengths of the flaps is stopped, and the existing state is maintained to stabilize the smoke absorption effect. If it is found through detection that the oil fume still escapes laterally even after the direction of the opening is adjusted to be perpendicular to the first center line, it indicates that the optimization of the flap structure cannot meet the demand of gathering the oil fume, and at this time, the rotational speed of the fan is increased to enhance the negative pressure adsorption capacity of the air inlet, and the escaped oil fume is captured by using stronger airflow force, thereby further improving the smoke absorption efficiency of the range hood.

[0178] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications, combinations and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A control method for a range hood, characterized in that, The range hood includes a smoke collection hood (1) and two flaps (2). The two flaps (2) are located at the smoke inlet of the smoke collection hood (1). The two flaps (2) can be flipped and extended around opposite edges. The edges of the two flaps (2) that are close to each other form an opening. The control method includes: Determine the location of the center point of the cooking fumes; Based on the position of the center point of the oil fume, the flip angle and / or extension length of the two flaps (2) are adjusted in real time to change the orientation and / or area of ​​the opening.

2. The control method according to claim 1, characterized in that, Determine the center point of the cooking fumes, including: Real-time monitoring of the concentration distribution of cooking fumes; Based on the distribution of the oil fume concentration, the location of the point with the highest oil fume concentration is determined, and the point with the highest oil fume concentration is taken as the center point of the oil fume.

3. The control method according to claim 1, characterized in that, Determine the center point of the cooking fumes, including: Determine the cooking recipes and / or cooking utensils; Based on the cooking recipe and / or the cooking appliance, obtain the corresponding pre-stored curve of the change between the center point of the oil fume and the cooking time; During the cooking process, the position of the center point of the oil fume is determined based on the real-time cooking time and the curve showing the change between the position of the center point of the oil fume and the cooking time.

4. The control method according to claim 1, characterized in that, Before adjusting the flipping angle and / or extension length of the two flaps (2) in real time according to the position of the center point of the oil fume to change the orientation and / or area of ​​the opening, the method further includes: Detect the lateral escape of cooking fumes. Based on the position of the center point of the oil fume, the flip angle and / or extension length of the two flaps (2) are adjusted in real time to change the orientation and / or area of ​​the opening, including: Based on the location of the center point of the oil fume and the lateral escape situation, the flipping angle and / or extension length of the two flaps (2) are adjusted in real time to change the orientation and / or area of ​​the opening.

5. The control method according to claim 4, characterized in that, The two flaps (2) include a flap (2) on the same side and a flap (2) on the opposite side; in the two areas formed by the range hood in the left and right directions, the center point of the oil fume is located in the same area as the flap (2) on the same side, and in a different area from the flap (2) on the opposite side; Based on the position of the center point of the oil fume and its lateral escape, the flipping angle and / or extension length of the two flaps (2) are adjusted in real time to change the orientation and / or area of ​​the opening, including: When the center point of the oil fume does not move and the oil fume escapes laterally, adjust the extension length of the opposite side flap and the same side flap so that the opposite side flap is coplanar with the center point of the oil fume, the minimum distance between the center point of the oil fume and the edge of the same side flap and the edge of the opposite side flap are equal, and the area of ​​the opening formed by the same side flap and the opposite side flap is increased.

6. The control method according to claim 4, characterized in that, The two flaps include a flap on the same side and a flap on the opposite side; in the two areas evenly divided in the left and right direction by the range hood, the center point of the oil fume is located in the same area as the flap on the same side, and in a different area from the flap on the opposite side; Based on the position of the center point of the oil fume and its lateral escape, the flipping angle and / or extension length of the two flaps (2) are adjusted in real time to change the orientation and / or area of ​​the opening, including: When the center point of the oil fume moves and the oil fume does not escape laterally, while keeping the opposite side flap at its maximum extension length, flip the opposite side flap until it is coplanar with the center point of the oil fume, and adjust the flip angle and extension length of the same side flap so that the center point of the oil fume is equal to the minimum distance between the edge of the same side flap and the edge of the opposite side flap.

7. The control method according to claim 6, characterized in that, The range hood is divided into a first area and a second area in the left and right directions; the two flaps (2) include a first flap (201) and a second flap (202), the first flap (201) is located in the first area, and the second flap (202) is located in the second area; the first area includes a first position point, and the second area includes a second position point; When the center point of the cooking fumes moves and the fumes do not escape laterally, while maintaining the opposite flap at its maximum extension length, the opposite flap is flipped until it is coplanar with the center point of the cooking fumes. The flipping angle and extension length of the same-side flap are then adjusted so that the center point of the cooking fumes is equal to the minimum distance between the edge of the same-side flap and the edge of the opposite-side flap, including: When the center point of the oil fume moves from the first position point to the second position point, and the oil fume does not escape laterally, the first flap (201) and the second flap (202) are controlled to change from a first state to a second state. In the first state, the first flap (201) is at its maximum extension length, the first flap (201) is coplanar with the center point of the oil fume, and the minimum distance between the center point of the oil fume and the edges of the first flap (201) and the second flap (202) is equal. In the second state, the second flap (202) is at its maximum extension length, the second flap (202) is coplanar with the center point of the oil fume, and the minimum distance between the center point of the oil fume and the edges of the first flap (201) and the second flap (202) is equal.

8. The control method according to claim 4, characterized in that, The two flaps (2) include a flap on the same side and a flap on the opposite side; in the two areas formed by the range hood in the left and right directions, the center point of the oil fume is located in the same area as the flap on the same side and in a different area from the flap on the opposite side; Based on the position of the center point of the oil fume and its lateral escape, the flipping angle and / or extension length of the two flaps (2) are adjusted in real time to change the orientation and / or area of ​​the opening, including: When the center point of the oil fume moves longitudinally and the oil fume escapes laterally, the flip angle and extension length of the opposite side flap and the same side flap are adjusted so that the opposite side flap is coplanar with the center point of the oil fume, the minimum distance between the center point of the oil fume and the edge of the same side flap and the edge of the opposite side flap are equal, and the area of ​​the opening formed by the same side flap and the opposite side flap is increased.

9. The control method according to claim 5 or 8, characterized in that, Based on the location of the center point of the oil fume and its lateral escape, the flipping angle and / or extension length of the two flaps (2) are adjusted in real time to change the orientation and / or area of ​​the opening. The method further includes: Detect the lateral escape of cooking fumes. When the fumes do not escape laterally, stop adjusting the opposite side flap and the same side flap; When the area of ​​the opening is increased to its maximum and the fumes escape laterally, the flip angle and extension length of the opposite-side flap and the same-side flap are adjusted so that the opposite-side flap is coplanar with the center point of the fumes, the minimum distance between the center point of the fumes and the edges of the same-side flap and the opposite-side flap are equal, and the opening formed by the same-side flap and the opposite-side flap changes in a direction perpendicular to the first center line; wherein, the first center line is the line connecting the center point of the fumes and the center point of the smoke inlet.

10. The control method according to claim 9, characterized in that, When the oil fumes escape laterally after the area of ​​the opening is increased to its maximum, the flip angle and extension length of the opposite-side flap and the same-side flap are adjusted so that the opposite-side flap is coplanar with the center point of the oil fumes, the minimum distance between the center point of the oil fumes and the edges of the same-side flap and the opposite-side flap are equal, and after the opening formed by the same-side flap and the opposite-side flap changes in a direction perpendicular to the line connecting the first centers, the method further includes: Detect the lateral escape of cooking fumes. Detect the orientation of the opening; When the fumes do not escape laterally, stop adjusting the flip angle and extension length of the opposite side flap and the same side flap; If the fumes still escape laterally after the direction of the opening is adjusted to be perpendicular to the first center line, the power of the fan in the range hood is increased.

11. A range hood, characterized in that, The range hood includes a smoke collection hood (1) and two flaps (2), the two flaps (2) being disposed at the smoke inlet of the smoke collection hood (1), the two flaps (2) being retractable and expandable around opposite edges, and the edges of the two flaps (2) being close to each other forming an opening; the range hood is used to perform the control method of the range hood as described in any one of claims 1-10.

12. The range hood according to claim 11, characterized in that, The flap (2) includes a first plate (21) and a second plate (22), the second plate (22) being embedded inside the first plate (21) and being slidable relative to the first plate (21).

13. The range hood according to claim 11, characterized in that, The range hood also includes a drive mechanism, which is mechanically connected to the two flaps (2) respectively, and is used to drive the flaps (2) to flip.

14. The range hood according to claim 13, characterized in that, The driving mechanism includes two rotary motors (23) and two rotating shafts (24). The opposite edges of the two flaps (2) are respectively fixedly connected to one of the rotating shafts (24). The rotary motors (23) are drive-connected to the rotating shafts (24) to drive the rotating shafts (24) and cause the flaps (2) to flip; and / or, The range hood also includes two fixing plates (3); the two fixing plates (3) are respectively fixed below the smoke collection hood (1), and are respectively rotatably connected to the opposite side edges of the two flaps (2); the two fixing plates (3) and the two flaps (2) in the closed state are coplanar.

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