An ultrasonic standing wave-based range hood and control method

Abstract

The embodiment of the present application discloses a kind of range hood based on ultrasonic standing wave and control method, the range hood based on ultrasonic standing wave includes smoke collecting cover and ultrasonic standing wave device, ultrasonic standing wave device includes ultrasonic wave generating mechanism and reflection mechanism, wherein, ultrasonic wave generating mechanism includes multiple ultrasonic wave generators and moving mechanism;Ultrasonic wave generator is used to emit ultrasonic wave, reflection mechanism is used to reflect ultrasonic wave and form standing wave, to gather in the oil fume particles in air flow and make it suspended;Moving mechanism is used to drive ultrasonic wave generator to move along preset circumferential trajectory in moving plane, moving plane is parallel with the flow direction of air inlet air flow, multiple position points are arranged on preset circumferential trajectory, and the number of position points is equal to the number of ultrasonic wave generator.The range hood realizes the effect of gathering oil fume, reducing oil fume speed, reducing oil fume activity and driving oil fume to transmission into range hood using ultrasonic standing wave.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a range hood and control method based on ultrasonic standing waves. Background Technology

[0002] Range hoods are essential in modern kitchens, their function being to purify cooking fumes and vent them outdoors, reducing the harm to human health and indoor environmental pollution. In actual use, while range hoods can remove most of the fumes generated during cooking, because they are open and the distance between the hood and the cooktop is limited, some fumes do not enter the hood but instead rise a certain distance and diffuse directly into the indoor environment.

[0003] Currently, common technologies used in range hoods to prevent the spread and escape of cooking fumes include smoke baffles and air curtains. However, smoke baffles take up a lot of space, which can lead to a poor cooking experience for users in small kitchens; air curtain range hoods are noisy and cannot reduce the activity of cooking fumes, posing a cooking safety hazard. Summary of the Invention

[0004] This invention provides a range hood and control method based on ultrasonic standing waves. The ultrasonic standing waves are used to collect oil fume particles in the incoming airflow, preventing the oil fume particles from accelerating and escaping during the upward process and failing to enter the range hood.

[0005] In a first aspect, embodiments of the present invention provide a range hood based on ultrasonic standing waves, including a smoke collection hood and an ultrasonic standing wave device. The smoke collection hood is provided with an air inlet, and the ultrasonic standing wave device is located on the air inlet side of the air inlet. The ultrasonic standing wave device includes:

[0006] An ultrasonic generating mechanism, comprising multiple ultrasonic generators and a moving mechanism;

[0007] The reflective mechanism is positioned opposite the ultrasonic generator and located on opposite sides of the airflow at the air inlet.

[0008] An ultrasonic generator is used to emit ultrasonic waves, and a reflection mechanism is used to reflect ultrasonic waves and form standing waves to collect oil fume particles in the incoming airflow and suspend them.

[0009] The moving mechanism is used to drive the ultrasonic generator to move along a preset circumferential trajectory in the moving plane. The moving plane is parallel to the airflow direction of the air inlet. Multiple position points are set on the preset circumferential trajectory, and the number of position points is equal to the number of ultrasonic generators.

[0010] The location points include a first location point and a second location point; in the direction of airflow, the first location point is located on the side of the second location point away from the air inlet.

[0011] Optionally, the preset circumferential trajectory is circular or elliptical, with multiple location points evenly distributed on the circumference.

[0012] Optionally, the number of location points is odd, and multiple location points are distributed symmetrically along an axis, with the extension direction of the axis of symmetry parallel to the direction of the airflow.

[0013] Optionally, the preset circumferential trajectory is a polygon, with the position points distributed at the vertices of the polygon.

[0014] Optionally, the preset circumferential trajectory is an equilateral triangle, which includes a first side, a second side, and a third side connected end to end. The extension direction of the first side is perpendicular to the airflow direction. In the airflow direction, the second side and the third side are both located on the side of the first side away from the air inlet.

[0015] Optionally, the first location point is the location point farthest from the air inlet in the direction of airflow flow among multiple location points, and / or, the second location point is the location point closest to the air inlet in the direction of airflow flow among multiple location points.

[0016] Secondly, embodiments of the present invention also provide a control method for a range hood based on ultrasonic standing waves, applicable to a range hood based on ultrasonic standing waves as described in any of the first aspects; the control method includes multiple normal cycle stages, any one of which includes:

[0017] Turn on the ultrasonic generator at the first position point to emit ultrasonic waves, which are then reflected by the reflection mechanism to form a standing wave that gathers the oil fume particles in the incoming airflow and suspends them; turn off the ultrasonic generator at the second position point to release the oil fume particles suspended in the corresponding standing wave.

[0018] Real-time monitoring of the amount of oil fumes suspended in the standing wave corresponding to the first location point;

[0019] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives each ultrasonic generator to move synchronously from one position point to the next position point along a preset circumferential trajectory.

[0020] Optionally, prior to multiple normal cycle phases, the following may also be included:

[0021] Get the operating setting of the range hood;

[0022] Based on the operating gear, determine the step movement time required for the ultrasonic generator to move from one position point to the next position point during the normal cycle phase.

[0023] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives each ultrasonic generator to synchronously move from one position point to the next position point along a preset circumferential trajectory, including:

[0024] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive each ultrasonic generator to move synchronously from one position point to the next position point along a preset circumferential trajectory within the stepping movement time.

[0025] Optionally, the operating gears include a first gear and a second gear, wherein the operating power of the first gear is greater than that of the second gear;

[0026] Based on the operating gear, determine the step movement time required for the ultrasonic generator to move from one position point to the next during the normal cycle phase, including:

[0027] When the operating gear is the first gear, the step movement time required for the ultrasonic generator to move from one position point to the next position point during the normal cycle phase is determined as the first movement time T1.

[0028] When the operating gear is the second gear, the step movement time required for the ultrasonic generator to move from one position point to the next position point during the normal cycle phase is determined as the second movement time T2; where T1 < T2.

[0029] Optionally, after determining the step movement time required for the ultrasonic generator to move from one position to the next during the normal cycle phase, based on the operating gear, the method further includes:

[0030] Based on the distance between each position point and the next position point on the preset circumferential trajectory, and the stepping movement time, determine the speed required for the ultrasonic generator at each position point to move to the next position point.

[0031] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives each ultrasonic generator to synchronously move from one position point to the next position point along a preset circumferential trajectory within the stepping movement time, including:

[0032] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive each ultrasonic generator to move synchronously from one position point to the next position point along a preset circumferential trajectory at the speed required for the ultrasonic generators stationed at each position point to move to the next position point.

[0033] Optionally, the control method also includes an end phase, which, in the time dimension, is located after the normal cycle phase;

[0034] The final stage includes:

[0035] When a command to turn off the range hood is received, all ultrasonic generators are turned off.

[0036] This invention provides a range hood and control method based on ultrasonic standing waves. The range hood includes a smoke collection hood and an ultrasonic standing wave device. The smoke collection hood has an air inlet, and the ultrasonic standing wave device is located on the air inlet side of the air inlet. The ultrasonic standing wave device includes an ultrasonic wave generating mechanism and a reflecting mechanism. The ultrasonic wave generating mechanism includes multiple ultrasonic generators and a moving mechanism. The reflecting mechanism is opposite to the ultrasonic generators and is located on opposite sides of the air inlet. The ultrasonic generators emit ultrasonic waves, and the reflecting mechanism reflects the ultrasonic waves to form a standing wave, thereby collecting and suspending the oil fume particles in the air inlet. The moving mechanism drives the ultrasonic generators to move along a preset circumferential trajectory in a moving plane. The moving plane is parallel to the air inlet flow direction. Multiple position points are set on the preset circumferential trajectory, and the number of position points is equal to the number of ultrasonic generators. The position points include a first position point and a second position point. In the air inlet flow direction, the first position point is located on the side of the second position point away from the air inlet. This range hood utilizes an ultrasonic standing wave device to create ultrasonic standing waves. These waves can gather and suspend oil fume particles in the incoming airflow, achieving the effects of concentrating the fumes, reducing their velocity and activity, and driving them into the range hood. This prevents oil fume particles from accelerating and escaping during their ascent, thus improving the range hood's smoke extraction efficiency and enhancing the user's cooking experience. Furthermore, the ultrasonic frequency is greater than or equal to 20kHz, which is inaudible to the human ear, so it will not cause noise to the user. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of a range hood based on ultrasonic standing waves provided in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of another range hood based on ultrasonic standing waves provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the principle structure of an ultrasonic standing wave device provided in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the structure of an ultrasonic generating mechanism provided in an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of another ultrasonic generating mechanism provided in an embodiment of the present invention;

[0042] Figure 6This is a flowchart illustrating a control method for a range hood based on ultrasonic standing waves provided in an embodiment of the present invention.

[0043] Figure 7 yes Figure 4 A schematic diagram of another corresponding ultrasonic generator mechanism;

[0044] Figure 8 yes Figure 5 A schematic diagram of another corresponding ultrasonic generator mechanism;

[0045] Figure 9 This is a time-dimensional schematic diagram of a control method for a range hood based on ultrasonic standing waves provided in an embodiment of the present invention;

[0046] Figure 10 This is a flowchart illustrating another control method for a range hood based on ultrasonic standing waves provided in an embodiment of the present invention.

[0047] Figure 11 This is a flowchart illustrating another control method for a range hood based on ultrasonic standing waves provided in an embodiment of the present invention;

[0048] Figure 12 This is a flowchart illustrating another control method for a range hood based on ultrasonic standing waves provided in an embodiment of the present invention;

[0049] Figure 13 This is a flowchart illustrating another control method for a range hood based on ultrasonic standing waves provided in an embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] 10-Smoke hood; 11-Air inlet;

[0052] 20 - Ultrasonic standing wave device;

[0053] 30-Ultrasonic generating mechanism; 31-Ultrasonic generator; 32-Moving plane; 33-Preset circumferential trajectory; 34-Energy storage device; 35-Axis of symmetry; 361-First side; 362-Second side; 363-Third side;

[0054] 40 - Reflection mechanism. Detailed Implementation

[0055] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0056] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] The term "comprising" and its variations as used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0058] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0059] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0060] This invention provides a range hood based on ultrasonic standing waves, such as... Figure 1 , Figure 2 and Figure 3 As shown, the range hood based on ultrasonic standing waves includes a smoke collection hood 10 and an ultrasonic standing wave device 20. The smoke collection hood 10 has an air inlet 11, and the ultrasonic standing wave device 20 is located on the air inlet side of the air inlet 11. The ultrasonic standing wave device 20 includes an ultrasonic wave generating mechanism 30 and a reflecting mechanism 40. The ultrasonic wave generating mechanism 30 includes multiple ultrasonic generators 31 and a moving mechanism. Figure 1 , Figure 2 and Figure 3(Not shown in the diagram, but exemplarily, the moving mechanism may be disposed in the back plate or on the surface of the ultrasonic generator 30); the reflecting mechanism 40 is opposite to the ultrasonic generator 31 and is located on opposite sides of the air intake airflow of the air inlet 11; the ultrasonic generator 31 is used to emit ultrasonic waves, and the reflecting mechanism 40 is used to reflect the ultrasonic waves and form standing waves to gather the oil fume particles in the air intake airflow and suspend them; the moving mechanism is used to drive the ultrasonic generator 31 to move along a preset circumferential trajectory 33 in the moving plane 32, the moving plane 32 is parallel to the air intake airflow direction X of the air inlet 11, and a plurality of position points are provided on the preset circumferential trajectory 33, the number of position points being equal to the number of ultrasonic generators 31; the position points include a first position point and a second position point; in the air intake airflow direction X, the first position point is located on the side of the second position point away from the air inlet 11.

[0061] Specifically, the ultrasonic standing wave device 20 includes an ultrasonic generating mechanism 30 and a reflecting mechanism 40. The ultrasonic generating mechanism 30 includes multiple ultrasonic generators 31. The reflecting mechanism 40 is positioned opposite the ultrasonic generators 31 and located on opposite sides of the airflow at the air inlet 11. The ultrasonic generators 31 can emit ultrasonic waves (with a frequency greater than or equal to 20kHz, which is inaudible to the human ear and therefore will not cause noise to the user). The reflecting mechanism 40 can reflect the ultrasonic waves. For example, the reflecting mechanism 40 can be a spherical reflector, which can reflect the ultrasonic waves emitted by each ultrasonic generator 31. According to the standing wave suspension principle, after the ultrasonic generators 31 emit ultrasonic waves of a certain frequency, they are reflected by the reflecting mechanism 40, forming two ultrasonic waves with the same frequency but opposite transmission directions below the range hood and above the stove. These two ultrasonic waves can interfere with each other and form a standing wave. Within the standing wave field, the oil fume particles are suspended due to the influence of acoustic radiation, thus concentrating the oil fume particles in the intake airflow. This reduces the activity of the oil fume particles in their rising path, preventing accelerated diffusion and escape, maintaining the cleanliness of the air / indoor environment around the range hood, and avoiding pollution of the user's chest and head by oil fumes. Simultaneously, under the action of the ultrasonic standing wave, both solid particles and liquid oil droplets undergo relative motion, colliding and condensing together. This reduces the number of solid particles and liquid oil droplets, while increasing the average diameter of both. Once these diameters reach a certain level, they are drawn into the range hood through the air inlet 11.

[0062] The ultrasonic generator 30 also includes a moving mechanism that can drive the ultrasonic generator 31 to move along a preset circumferential trajectory 33 in the moving plane 32. That is, the moving mechanism can change the position of the ultrasonic generator 31, thereby changing the position of the standing wave formed between the ultrasonic generator 30 and the reflecting mechanism 40, and adjusting the acoustic radiation force required to suspend the oil fume particles within the standing wave field. By using the moving mechanism to drive the ultrasonic generator 31, on the one hand, a boundary can be formed to prevent the oil fume particles from diffusing and escaping; on the other hand, the oil fume particles can be driven to be transported into the range hood. Furthermore, the ultrasonic generator 30 also includes an energy storage device 34, which can provide energy for the normal operation of the ultrasonic generator 31 and the moving mechanism.

[0063] The movable plane 32 is parallel to the airflow direction X of the air inlet 11. Each ultrasonic generator 31 is disposed on the movable plane 32 and can move along a preset circumferential trajectory 33. Multiple position points are provided on the preset circumferential trajectory 33, and the number of position points is equal to the number of ultrasonic generators 31. For example, each ultrasonic generator 31 can synchronously cyclically move along the preset circumferential trajectory 33 at each position point. The position points include a first position point and a second position point; in the airflow direction X, the first position point is located on the side of the second position point away from the air inlet 11. For example, if an ultrasonic generator 31 is driven to move from the first position point to the second position point using the movable mechanism, the standing wave formed between the ultrasonic generator 31 and the reflecting mechanism 40 will also move accordingly from the position corresponding to the first position point to the position corresponding to the second position point. Furthermore, since the second position point is closer to the air inlet 11, the standing wave formed between the ultrasonic generator 31 and the reflection mechanism 40 can move the oil fume particles suspended in the air intake airflow toward the air inlet 11, making it easier for the oil fume particles suspended in the subsequent air intake airflow to be sucked into the range hood by the air inlet 11.

[0064] The technical solution in this embodiment of the invention includes a smoke collection hood and an ultrasonic standing wave device. The smoke collection hood has an air inlet, and the ultrasonic standing wave device is located on the air inlet side of the air inlet. The ultrasonic standing wave device includes an ultrasonic generating mechanism and a reflecting mechanism. The ultrasonic generating mechanism includes multiple ultrasonic generators and a moving mechanism. The reflecting mechanism is opposite to the ultrasonic generators and is located on opposite sides of the air inlet. The ultrasonic generators are used to emit ultrasonic waves, and the reflecting mechanism is used to reflect the ultrasonic waves and form a standing wave to collect the oil fume particles in the air inlet and suspend them. The moving mechanism is used to drive the ultrasonic generators to move along a preset circumferential trajectory in a moving plane. The moving plane is parallel to the air inlet airflow direction. Multiple position points are set on the preset circumferential trajectory, and the number of position points is equal to the number of ultrasonic generators. The position points include a first position point and a second position point. In the air inlet airflow direction, the first position point is located on the side of the second position point away from the air inlet. This range hood utilizes an ultrasonic standing wave device to create ultrasonic standing waves. These waves can gather and suspend oil fume particles in the incoming airflow, achieving the effects of concentrating the fumes, reducing their velocity and activity, and driving them into the range hood. This prevents oil fume particles from accelerating and escaping during their ascent, thus improving the range hood's smoke extraction efficiency and enhancing the user's cooking experience. Furthermore, the ultrasonic frequency is greater than or equal to 20kHz, which is inaudible to the human ear, so it will not cause noise to the user.

[0065] Optionally, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the preset circumferential trajectory 33 is circular or elliptical, with multiple position points evenly distributed on the circumference.

[0066] Specifically, a moving mechanism can be used to drive each ultrasonic generator 31 to move along a preset circumferential trajectory 33 in a moving plane 32. The preset circumferential trajectory 33 can be circular or elliptical, and multiple position points set on the preset circumferential trajectory 33 are evenly distributed on the circumference, so that the moving mechanism can be used to drive the ultrasonic generator 31 to move from one position point to another. For example, Figure 4 The preset circumferential trajectory 33 shown is circular, and three position points are set on the preset circumferential trajectory 33, namely position point ①, position point ②, and position point ③. Position points ①, ②, and ③ are evenly distributed on the circumference of the circle. It should be noted that... Figure 4 The example shown is for illustrative purposes only and is not intended to be limiting.

[0067] Optionally, continue to refer to Figure 1 , Figure 2 , Figure 3 and Figure 4The number of location points is odd, and multiple location points are distributed symmetrically along the axis of symmetry 35. The extension direction of the axis of symmetry 35 is parallel to the airflow direction X.

[0068] For example, Figure 4 The preset circumferential trajectory 33 shown is circular, and three position points are set on the preset circumferential trajectory 33, namely position point ①, position point ②, and position point ③, which are evenly distributed on the circumference of the circle. In one embodiment, position point ② and position point ③ are axially symmetrical about an axis of symmetry 35, and position point ① is located on the axis of symmetry 35, and the extension direction of the axis of symmetry 35 is parallel to the airflow direction X.

[0069] Optionally, such as Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the preset circumferential trajectory 33 is polygonal, with the position points distributed at the vertices of the polygon.

[0070] Specifically, a moving mechanism can be used to drive each ultrasonic generator 31 to move along a preset circumferential trajectory 33 in a moving plane 32. The preset circumferential trajectory 33 can be polygonal (for example, polygons include triangles, quadrilaterals (for example, quadrilaterals include squares, rectangles, trapezoids, etc.), pentagons, etc.), and multiple position points set on the preset circumferential trajectory 33 are distributed at the vertices of the polygon, so the moving mechanism can be used to drive the ultrasonic generator 31 to move from one position point to another. For example, Figure 5 The preset circumferential trajectory 33 shown is triangular, and three position points are set on the preset circumferential trajectory 33, namely position point ④, position point ⑤, and position point ⑥. Position points ④, ⑤, and ⑥ are located at the vertices of the triangle. It should be noted that... Figure 5 The example shown is for illustrative purposes only and is not intended to be limiting.

[0071] Optionally, continue to refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 The preset circumferential trajectory 33 is an equilateral triangle. The equilateral triangle includes a first side 361, a second side 362, and a third side 363 connected end to end. The extension direction of the first side 361 is perpendicular to the airflow direction X. In the airflow direction X, the second side 362 and the third side 363 are both located on the side of the first side 361 away from the air inlet 11.

[0072] For example, Figure 5The preset circumferential trajectory 33 shown is an equilateral triangle, and three position points are set on the preset circumferential trajectory 33, namely position point ④, position point ⑤, and position point ⑥, which are distributed at the vertices of the equilateral triangle. The equilateral triangle includes a first side 361, a second side 362, and a third side 363 connected end-to-end, with the first side 361, the second side 362, and the third side 363 having the same length. In one embodiment, the extension direction of the first side 361 is perpendicular to the airflow direction X. In the airflow direction X, the second side 362 and the third side 363 are both located on the side of the first side 361 furthest from the air inlet 11.

[0073] Optionally, continue to refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 The first position point is the position point that is farthest from the air inlet 11 in the airflow direction X among multiple position points, and / or the second position point is the position point that is closest to the air inlet 11 in the airflow direction X among multiple position points.

[0074] Specifically, multiple position points are set on the preset circumferential trajectory 33, including a first position point and a second position point. In the airflow direction X, the first position point is located on the side of the second position point away from the air inlet 11. That is, in the airflow direction X, the distance between the first position point and the air inlet 11 is greater than the distance between the second position point and the air inlet 11. Figure 4 For example, Figure 4 The first position point can be position point ①, which is the position point farthest from the air inlet 11 in the airflow direction X of the multiple position points. Figure 4 The second position point can be position point ② or position point ③, where position point ② or position point ③ is the position point closest to the air inlet 11 in the airflow direction X among multiple position points. Figure 5 For example, Figure 5 The first position point in the middle can be position point ④, which is the position point farthest from the air inlet 11 in the airflow direction X of the multiple position points; Figure 5 The second position point can be position point ⑤ or position point ⑥. Position point ⑤ or position point ⑥ is the position point that is closest to the air inlet 11 in the airflow direction X among multiple position points.

[0075] Based on the same inventive concept, embodiments of the present invention also provide a control method for a range hood based on ultrasonic standing waves, applicable to a range hood based on ultrasonic standing waves as provided in any of the embodiments of the present invention. Figure 6 As shown, the control method includes multiple normal cycle stages, and any one normal cycle stage includes:

[0076] S110. Turn on the ultrasonic generator at the first position point to emit ultrasonic waves and form a standing wave that gathers the oil fume particles in the incoming airflow and suspends them; turn off the ultrasonic generator at the second position point to release the oil fume particles suspended in the corresponding standing wave.

[0077] Specifically, please refer to Figure 1 and Figure 2 Among the multiple positions set on the preset circumferential trajectory 33, in the direction of airflow X, the first position is located on the side of the second position away from the air inlet 11. That is, in the direction of airflow X, the distance between the first position and the air inlet 11 is greater than the distance between the second position and the air inlet 11. In other words, in the direction of airflow X, the distance between the first position and the stove is less than the distance between the second position and the stove. When the ultrasonic generator 31 located at the first position is turned on, that is, the ultrasonic generator 31 begins to emit ultrasonic waves, the ultrasonic waves change their propagation direction after being reflected by the reflection mechanism 40 during propagation. Two ultrasonic waves with the same frequency and opposite propagation directions can be formed below the range hood and above the stove. These two ultrasonic waves can interfere with each other and form a standing wave. The oil fume particles in this standing wave field are suspended due to the influence of sound radiation force, thereby using the standing wave to collect the oil fume particles in the airflow. Turning on the ultrasonic generator 31 at the first position point, which is closer to the cooktop, allows it to collect the oil fume particles above the cooktop, preventing them from accelerating and escaping as they rise. Turning off the ultrasonic generator 31 at the second position point, which is closer to the range hood, releases the collected oil fume particles suspended in the corresponding standing wave, facilitating their absorption into the range hood through the air inlet 11.

[0078] S120: Real-time monitoring of the amount of oil fumes suspended in the standing wave corresponding to the first location point.

[0079] Specifically, please refer to Figure 1 and Figure 2The first position point is closer to the stove, and the amount of oil fume suspended in the standing wave corresponding to the first position point is the total amount of oil fume particles collected by the ultrasonic generator 31 at the first position point. The amount of oil fume suspended in the standing wave corresponding to the first position point can be monitored in real time by an oil fume concentration monitor or a gas sensor. For example, the monitoring principles of oil fume amount include electrochemical method, light scattering method, and light detection method. Among them, the electrochemical method uses an oil fume probe to sample oil fume gas at the oil fume exhaust pipe and other locations. The collected oil fume gas is transmitted to a sieve sensor with multiple pores. When the pores of the sieve sensor receive oil fume particles, the resistance of the sieve sensor increases, which leads to a change in the current intensity. That is, the oil fume concentration can be calculated based on the linear relationship (directly proportional relationship) between the current intensity and the oil fume concentration. Light scattering methods include forward light scattering, backward light scattering, and focused light scattering. These methods all utilize a laser beam to illuminate locations such as oil fume exhaust pipes. The oil fume particles present in these locations cause the laser beam to scatter to varying degrees. The oil fume concentration can be calculated based on the linear relationship (directly proportional) between the intensity of the scattered light and the oil fume concentration. The light scattering method uses an optical sensor to sample oil fume gas at locations such as oil fume exhaust pipes. The emitting end of this optical sensor continuously emits infrared light waves. When oil fume particles enter the optical sensor, they intersect with the infrared light waves, causing scattering and astigmatism. The receiving end of the optical sensor receives infrared light waves with different degrees of scattering. The oil fume concentration can then be calculated based on the linear relationship (directly proportional) between the intensity of the infrared light waves and the oil fume concentration.

[0080] S130 When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives each ultrasonic generator to move synchronously from one position point to the next position point along a preset circumferential trajectory.

[0081] The preset values ​​can be determined based on the cooking status and performance of the range hood. Specifically, with Figure 4 For example, Figure 4 The preset circumferential trajectory 33 is circular. Figure 4 The preset circumferential trajectory 33 has three position points, namely position point ①, position point ②, and position point ③. At the current normal cycle time, position point ① corresponds to ultrasonic generator A, position point ② corresponds to ultrasonic generator B, and position point ③ corresponds to ultrasonic generator C. Figure 4The first position point can be position point ①, and the second position point can be position point ②. When ultrasonic generator A is turned on at position point ①, and the amount of oil fume suspended in the standing wave corresponding to position point ① reaches a preset value, ultrasonic generator A, ultrasonic generator B, and ultrasonic generator C can be driven by a moving mechanism to move synchronously in order to reasonably release the oil fume particles suspended in the corresponding standing wave. Figure 7 yes Figure 4 The diagram illustrates how, after the normal cycle time shown, ultrasonic generators A, B, and C are synchronously moved from one position point to the next along a preset circumferential trajectory 33 using a moving mechanism. Figure 7 Position ① corresponds to ultrasonic generator C, position ② corresponds to ultrasonic generator A, and position ③ corresponds to ultrasonic generator B. That is, ultrasonic generators A, B, and C, driven by the moving mechanism, move counterclockwise synchronously along the preset circumferential trajectory 33 of the circle. Ultrasonic generator A moves from position ① to position ②, while ultrasonic generator B moves from position ② to position ③, and ultrasonic generator C moves from position ③ to position ①. When ultrasonic generator A reaches position ②, it shuts off, and the oil fume particles suspended in the standing wave corresponding to ultrasonic generator A are released. Figure 4 and Figure 7 The corresponding normal cycle phase moves in a circular pattern.

[0082] by Figure 5 For example, Figure 5 The preset circumferential trajectory 33 is triangular. Figure 5 The preset circumferential trajectory 33 has three position points, namely position point ④, position point ⑤, and position point ⑥. At the current normal cycle time, position point ④ corresponds to ultrasonic generator D, position point ⑤ corresponds to ultrasonic generator E, and position point ⑥ corresponds to ultrasonic generator F. Figure 5 The first position point can be position point ④, and the second position point can be position point ⑥. When the ultrasonic generator D at position point ④ is turned on, and the amount of oil fume suspended in the standing wave corresponding to position point ④ reaches the preset value, the ultrasonic generator D, ultrasonic generator E, and ultrasonic generator F can be moved by the moving mechanism to reasonably release the oil fume particles suspended in the corresponding standing wave. Figure 8 yes Figure 5 The diagram illustrates how, after the normal cycle time shown, ultrasonic generators D, E, and F are synchronously moved from one position point to the next along a preset circumferential trajectory 33 using a moving mechanism. Figure 8Position ④ corresponds to ultrasonic generator E, position ⑤ corresponds to ultrasonic generator F, and position ⑥ corresponds to ultrasonic generator D. That is, ultrasonic generators D, E, and F, driven by the moving mechanism, move synchronously clockwise along the preset circumferential trajectory 33 of the triangle. Ultrasonic generator D moves from position ④ to position ⑥, while ultrasonic generator E moves from position ⑤ to position ④, and ultrasonic generator F moves from position ⑥ to position ⑤. When ultrasonic generator D reaches position ⑥, it shuts off, and the oil fume particles suspended in the standing wave corresponding to ultrasonic generator D are released. Figure 5 and Figure 8 The corresponding normal cycle phase moves in a triangular pattern.

[0083] The technical solution in this embodiment of the invention first activates the ultrasonic generator at a first position point. The ultrasonic generator emits ultrasonic waves, which are then reflected by a reflection mechanism to form a standing wave that gathers and suspends oil fume particles in the incoming airflow. The ultrasonic generator at a second position point is then deactivated to release the oil fume particles suspended in the corresponding standing wave. The amount of oil fume suspended in the standing wave at the first position point is then monitored in real time. Finally, when the amount of oil fume suspended in the standing wave at the first position point reaches a preset value, a moving mechanism drives each ultrasonic generator to synchronously move along a preset circumferential trajectory from one position point to the next. Using this method, an ultrasonic standing wave is formed by the ultrasonic standing wave device. This ultrasonic standing wave gathers and suspends oil fume particles in the incoming airflow. The activation and deactivation of the ultrasonic generators, based on their movement positions, achieves the effects of gathering oil fume, reducing its velocity, decreasing its activity, and driving it into the range hood. This prevents oil fume particles from accelerating and escaping during their ascent without entering the range hood, thus improving the range hood's smoke extraction effect and effectively enhancing the user's cooking experience.

[0084] Optionally, such as Figure 9 As shown, the control method also includes an end phase, which is located after the normal cycle phase in the time dimension; the end phase includes: turning off each ultrasonic generator when a command to turn off the range hood is received.

[0085] Specifically, the control method includes multiple normal cycle stages and an end stage. In terms of time, the end stage follows the multiple normal cycle stages. The normal cycle stage utilizes the standing waves generated by the ultrasonic standing wave device to collect and suspend the oil fume particles in the incoming airflow, and then appropriately releases the suspended oil fume particles from the corresponding standing waves. The end stage can be the cooking end stage, where, upon receiving a command to turn off the range hood, the ultrasonic generators in the ultrasonic standing wave device are correspondingly shut down.

[0086] This invention also provides a control method for a range hood based on ultrasonic standing waves, which is an optimization of the above embodiments. Optionally, before multiple normal cycle stages, it further includes:

[0087] Get the operating setting of the range hood;

[0088] Based on the operating gear, determine the step movement time required for the ultrasonic generator to move from one position point to the next position point during the normal cycle phase.

[0089] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives each ultrasonic generator to synchronously move from one position point to the next position point along a preset circumferential trajectory, including:

[0090] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive each ultrasonic generator to move synchronously from one position point to the next position point along a preset circumferential trajectory within the stepping movement time.

[0091] For details not covered in this embodiment, please refer to the above embodiments. Figure 10 As shown, the control method includes:

[0092] S210: Obtain the operating setting of the range hood.

[0093] Specifically, users can start the range hood via a power button, voice command, or gesture command. In response to the start command, the range hood system begins operation. For example, in one embodiment, the current operating level of the range hood can be determined based on the fan current signal and / or duct pressure signal. The range hood includes different operating levels (for example, operating levels may include low, high, and stir-fry levels). It is understood that different operating levels correspond to different amounts of oil fumes and different suction capabilities. For example, when the range hood is operating at a low level, the concentration of oil fumes generated during cooking is low, and the diffusion and escape of oil fume particles during their ascent is small. Therefore, the step-by-step movement time required for the ultrasonic generator to move from one position to the next during normal circulation can be larger. That is, only a small amount of acoustic radiation force is needed within the standing wave field corresponding to the ultrasonic generator to achieve the suspension, movement, and release of oil fume particles. When the range hood is set to high power, the concentration of oil fumes produced by the stove during cooking is relatively high, and the amount of oil fume particles escaping during the upward process is also relatively large. Therefore, the step movement time required for the ultrasonic generator to move from one position point to the next position point during the normal cycle phase needs to be small. In other words, a large acoustic radiation force is required in the standing wave field corresponding to the ultrasonic generator to achieve the suspension, movement and release of oil fume particles.

[0094] S220. Based on the operating gear, determine the step movement time required for the ultrasonic generator to move from one position point to the next during the normal cycle phase.

[0095] Optionally, the operating gear includes a first gear and a second gear, where the operating power of the first gear is greater than that of the second gear. Based on the operating gear, the step movement time required for the ultrasonic generator to move from one position point to the next during the normal cycle phase is determined, including: when the operating gear is the first gear, the step movement time required for the ultrasonic generator to move from one position point to the next during the normal cycle phase is determined as the first movement time T1; when the operating gear is the second gear, the step movement time required for the ultrasonic generator to move from one position point to the next during the normal cycle phase is determined as the second movement time T2; wherein, T1 < T2.

[0096] Specifically, the range hood has two operating levels: a first level and a second level, with the first level having a higher operating power than the second level. For example, the first level can be a high setting, and the second level can be a low setting. The high setting corresponds to a higher concentration of cooking fumes, resulting in greater diffusion and escape of the fumes during their ascent. Therefore, the first movement time T1 required for the ultrasonic generator to move from one position to the next during normal operation is required to be relatively short, meaning the collection and release of fumes should be achieved in a shorter time. The low setting corresponds to a lower concentration of cooking fumes, resulting in less diffusion and escape of the fumes during their ascent. Therefore, the second movement time T2 required for the ultrasonic generator to move from one position to the next during normal operation is required to be relatively long, meaning the collection and release of fumes should be achieved in a longer time.

[0097] S230. Turn on the ultrasonic generator at the first position point to emit ultrasonic waves and form a standing wave that is reflected by the reflection mechanism, so as to gather the oil fume particles in the airflow and suspend them; turn off the ultrasonic generator at the second position point to release the oil fume particles suspended in the corresponding standing wave.

[0098] S240: Real-time monitoring of the amount of oil fumes suspended in the standing wave corresponding to the first location point.

[0099] S250 When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive each ultrasonic generator to move synchronously from one position point to the next position point along a preset circumferential trajectory within the stepping movement time.

[0100] Specifically, with Figure 4 For example, Figure 4 The preset circumferential trajectory 33 is circular. Figure 4The preset circumferential trajectory 33 has three position points: position point ①, position point ②, and position point ③. At the current normal cycle time, position point ① corresponds to ultrasonic generator A, position point ② corresponds to ultrasonic generator B, and position point ③ corresponds to ultrasonic generator C. When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism can drive each ultrasonic generator 31. Figure 7 yes Figure 4 The diagram illustrates how, after the normal cycle time shown, ultrasonic generators A, B, and C are synchronously moved from one position point to the next along a preset circumferential trajectory 33 using a moving mechanism. Figure 7 Driven by the moving mechanism, ultrasonic generators A, B, and C move counterclockwise along the preset circumferential trajectory 33 of the circle. That is, within the same step movement time T, ultrasonic generator A moves from position ① to position ②, ultrasonic generator B moves from position ② to position ③, and ultrasonic generator C moves from position ③ to position ①.

[0101] by Figure 5 For example, Figure 5 The preset circumferential trajectory 33 is triangular. Figure 4 The preset circumferential trajectory 33 has three position points: position point ④, position point ⑤, and position point ⑥. At the current normal cycle time, position point ④ corresponds to ultrasonic generator D, position point ⑤ corresponds to ultrasonic generator E, and position point ⑥ corresponds to ultrasonic generator F. When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches the preset value, the moving mechanism can drive each ultrasonic generator 31. Figure 8 yes Figure 5 The diagram illustrates how, after the normal cycle time shown, ultrasonic generators D, E, and F are synchronously moved from one position point to the next along a preset circumferential trajectory 33 using a moving mechanism. Figure 8 Driven by the moving mechanism, ultrasonic generators D, E, and F move clockwise synchronously along the preset circumferential trajectory 33 of the triangle. That is, within the same step movement time T, ultrasonic generator D moves from position point ④ to position point ⑥, while ultrasonic generator E moves from position point ⑤ to position point ④, and ultrasonic generator F moves from position point ⑥ to position point ⑤.

[0102] This invention also provides a control method for a range hood based on ultrasonic standing waves, which is an optimization of the above embodiments. Optionally, before multiple normal cycle stages, it further includes:

[0103] Get the operating setting of the range hood;

[0104] Based on the operating gear, determine the step movement time required for the ultrasonic generator to move from one position point to the next position point during the normal cycle phase.

[0105] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives each ultrasonic generator to synchronously move from one position point to the next position point along a preset circumferential trajectory, including:

[0106] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive each ultrasonic generator to move synchronously from one position point to the next position point along a preset circumferential trajectory within the stepping movement time.

[0107] Furthermore, after determining the step movement time required for the ultrasonic generator to move from one position to the next during the normal cycle phase based on the operating gear, the process also includes:

[0108] Based on the distance between each position point and the next position point on the preset circumferential trajectory, and the stepping movement time, determine the speed required for the ultrasonic generator at each position point to move to the next position point.

[0109] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives each ultrasonic generator to synchronously move from one position point to the next position point along a preset circumferential trajectory within the stepping movement time, including:

[0110] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive each ultrasonic generator to move synchronously from one position point to the next position point along a preset circumferential trajectory at the speed required for the ultrasonic generators stationed at each position point to move to the next position point.

[0111] For details not covered in this embodiment, please refer to the above embodiments. Figure 11 As shown, the control method includes:

[0112] S310: Obtain the operating setting of the range hood.

[0113] S320. Based on the operating gear, determine the step movement time required for the ultrasonic generator to move from one position point to the next during the normal cycle phase.

[0114] S330. Based on the distance between each position point and the next position point on the preset circumferential trajectory, and the stepping movement time, determine the speed required for the ultrasonic generator at each position point to move to the next position point.

[0115] Specifically, with Figure 4 and Figure 7 For example, by Figures 4 to 7 One movement process constitutes one normal cycle phase. During this normal cycle phase, ultrasonic generator A moves from position ① to position ②, while ultrasonic generator B moves from position ② to position ③, and ultrasonic generator C moves from position ③ to position ①. The preset circumferential trajectory 33 is circular, and the distance between position ① and position ② on this circular preset circumferential trajectory 33 is 2πR / 3, where R is the radius of the circle. Based on the operating mode, the step movement time required for ultrasonic generator A to move from one position point to the next during the normal cycle phase can be defined as T. Then, according to the formula V1=(2πR / 3) / T=2πR / 3T, the speed V1 required for ultrasonic generator A, currently stationary at position ①, to move to position ② is calculated (for example, this can be understood as ultrasonic generator A moving at a constant speed from position ① to position ②). Similarly, the distance between position ② and position ③ on this circular preset circumferential trajectory 33 is 2πR / 3. Based on the operating mode, the step movement time required for ultrasonic generator B to move from one position point to the next during the normal cycle phase can be determined as T. Then, according to the formula V2 = (2πR / 3) / T = 2πR / 3T, the speed V2 required for ultrasonic generator B, which is stationary at position ②, to move to position ③ is calculated (exemplarily, this can be understood as ultrasonic generator B moving at a constant speed from position ② to position ③). Similarly, the distance between position ③ and position ① on the preset circular trajectory 33 is 2πR / 3. Based on the operating mode, the step movement time required for ultrasonic generator C to move from one position point to the next during the normal cycle phase can be determined as T. Then, according to the formula V3 = (2πR / 3) / T = 2πR / 3T, the speed V3 required for ultrasonic generator C, which is stationary at position ③, to move to position ① is calculated (exemplarily, this can be understood as ultrasonic generator C moving at a constant speed from position ③ to position ①). Furthermore, Figure 7 During the next movement, the speed required for ultrasonic generator A to move from position ② to position ③ is V1 = (2πR / 3) / T = 2πR / 3T, the speed required for ultrasonic generator B to move from position ③ to position ① is V2 = (2πR / 3) / T = 2πR / 3T, and the speed required for ultrasonic generator C to move from position ① to position ② is V3 = (2πR / 3) / T = 2πR / 3T.

[0116] by Figure 5 and Figure 8 For example, by Figures 5 to 8One movement process constitutes one normal cycle phase. During this phase, ultrasonic generator D moves from position ④ to position ⑥, while ultrasonic generator E moves from position ⑤ to position ④, and ultrasonic generator F moves from position ⑥ to position ⑤. The preset circumferential trajectory 33 is triangular, and the distance between position ④ and position ⑥ on this triangular trajectory 33 is the length L2 of the second side 362. Based on the operating mode, the step movement time required for ultrasonic generator D to move from one position to the next during the normal cycle phase can be defined as T. Then, according to the formula V4 = L2 / T, the speed V4 required for ultrasonic generator D, currently stationary at position ④, to move to position ⑥ is calculated (for example, this can be understood as ultrasonic generator D moving at a constant speed from position ④ to position ⑥). Similarly, the distance between position ⑤ and position ④ on this triangular trajectory 33 is the length L3 of the third side 363. Based on the operating mode, the step movement time required for ultrasonic generator E to move from one position to the next during the normal cycle phase can be defined as T. Then, according to the formula V5 = L3 / T, the speed V5 required for the ultrasonic generator E, which is stationary at position ⑤, to move to position ④ is calculated (exemplarily, this can be understood as the ultrasonic generator E moving from position ⑤ to position ④ at a constant speed). Similarly, the distance between position ⑥ and position ⑤ on the preset circumferential trajectory 33 of the triangle is the length L1 of the first side 361. Based on the operating gear, the step movement time required for the ultrasonic generator F to move from one position point to the next during the normal cycle phase can be T. Then, according to the formula V6 = L1 / T, the speed V6 required for the ultrasonic generator F, which is stationary at position ⑥, to move to position ⑤ is calculated (exemplarily, this can be understood as the ultrasonic generator F moving from position ⑥ to position ⑤ at a constant speed). It can be understood that when the preset circumferential trajectory 33 is an equilateral triangle, L1 = L2 = L3. Furthermore, Figure 8 During the next movement, the speed required for ultrasonic generator D to move from position ⑥ to position ⑤ is V4 = L1 / T, the speed required for ultrasonic generator E to move from position ④ to position ⑥ is V5 = L2 / T, and the speed required for ultrasonic generator F to move from position ⑤ to position ④ is V6 = L3 / T.

[0117] S340. Turn on the ultrasonic generator at the first position point to emit ultrasonic waves and form a standing wave that is reflected by the reflection mechanism, so as to gather the oil fume particles in the airflow and suspend them; turn off the ultrasonic generator at the second position point to release the oil fume particles suspended in the corresponding standing wave.

[0118] S350: Real-time monitoring of the amount of oil fumes suspended in the standing wave corresponding to the first location point.

[0119] S360 When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive each ultrasonic generator to move synchronously from one position point to the next position point along a preset circumferential trajectory at the speed required for the ultrasonic generators at each position point to move to the next position point.

[0120] Specifically, with Figure 4 and Figure 7 For example, by Figures 4 to 7 One movement process constitutes one normal cycle phase. When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism can drive each ultrasonic generator 31. Driven by the moving mechanism, ultrasonic generators A, B, and C move counterclockwise along the preset circumferential trajectory 33 of the circle. That is, within the same step movement time, ultrasonic generator A moves from position ① to position ② at a determined speed V1 (V1 = 2πR / 3T), while ultrasonic generator B moves from position ② to position ③ at a determined speed V2 (V2 = 2πR / 3T), and ultrasonic generator C moves from position ③ to position ① at a determined speed V3 (V3 = 2πR / 3T).

[0121] by Figure 5 and Figure 8 For example, by Figures 5 to 8 One movement process constitutes one normal cycle phase. When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism can drive each ultrasonic generator 31. Driven by the moving mechanism, ultrasonic generators D, E, and F move clockwise synchronously along the preset circumferential trajectory 33 of the triangle. That is, within the same step movement time, ultrasonic generator D moves from position point ④ to position point ⑥ at a determined speed V4 (V4 = L2 / T), while ultrasonic generator E moves from position point ⑤ to position point ④ at a determined speed V5 (V4 = L3 / T), and ultrasonic generator F moves from position point ⑥ to position point ⑤ at a determined speed V6 (V6 = L1 / T).

[0122] This invention also provides a control method for a range hood based on ultrasonic standing waves, such as... Figure 12 As shown, with Figure 4 and Figure 7For example, firstly, the operating level of the range hood is identified. For instance, this operating level can include low, high, and high-power settings, with the high-power setting having a higher operating power than the low-power setting, and the high-power setting having a higher operating power than the high-power setting. Based on this operating level, the step-by-step movement time T required for the ultrasonic generator 31 to move from one position point to the next can be determined. Specifically, when the operating level is low, T = T1; when the operating level is high, T = T2; and when the operating level is high-power, T = T3 (0 < T3 < T2 < T1). Then, during the normal cycle phase, the ultrasonic generator A located at position point ① is activated. The ultrasonic generator A emits ultrasonic waves, which are reflected by the reflective structure to form a standing wave. This standing wave can collect the oil fume particles in the incoming airflow and suspend them. The amount of oil fume suspended in the standing wave corresponding to position point ① is monitored in real time. If the amount of oil fume does not reach a preset value, the amount of oil fume suspended in the standing wave corresponding to position point ① continues to be monitored in real time. When the amount of cooking fumes reaches a preset value, the moving mechanism drives each ultrasonic generator 31 to move synchronously from one position point to the next along a preset circumferential trajectory 33 of the circle. This satisfies the following conditions: ultrasonic generator A moves from position ① to position ② at a speed of V1 = 2πR / 3T; ultrasonic generator B moves from position ② to position ③ at a speed of V2 = 2πR / 3T; and ultrasonic generator C moves from position ③ to position ① at a speed of V3 = 2πR / 3T; where R is the radius of the circle. Then, ultrasonic generator A at position ② is turned off to release the cooking fume particles suspended in the corresponding standing wave. Finally, in the ending phase, i.e., upon receiving the command to turn off the range hood, each ultrasonic generator 31 is turned off.

[0123] This invention also provides a control method for a range hood based on ultrasonic standing waves, such as... Figure 13 As shown, with Figure 5 and Figure 8For example, firstly, the operating level of the range hood is identified. For instance, this operating level can include low, high, and high-power settings, with the high-power setting having a higher operating power than the low-power setting, and the high-power setting having a higher operating power than the high-power setting. Based on this operating level, the step-by-step movement time T required for the ultrasonic generator 31 to move from one position point to the next can be determined. Specifically, when the operating level is low, T = T1; when the operating level is high, T = T2; and when the operating level is high-power, T = T3 (0 < T3 < T2 < T1). Then, during the normal cycle phase, the ultrasonic generator D located at position point ④ is activated. The ultrasonic generator D emits ultrasonic waves, which are reflected by the reflective structure to form a standing wave. This standing wave can collect the oil fume particles in the incoming airflow and suspend them. The amount of oil fume suspended in the standing wave corresponding to position point ④ is monitored in real time. If the amount of oil fume does not reach a preset value, the amount of oil fume suspended in the standing wave corresponding to position point ④ continues to be monitored in real time. When the amount of oil fume reaches a preset value, the moving mechanism drives each ultrasonic generator 31 to move synchronously from one position point to the next along a preset circumferential trajectory 33 of the equilateral triangle. This satisfies the following conditions: ultrasonic generator D moves from position ④ to position ⑥ at a speed of V1 = L / T; ultrasonic generator E moves from position ⑤ to position ④ at a speed of V2 = L / T; and ultrasonic generator F moves from position ⑥ to position ⑤ at a speed of V3 = L / T; where L is the side length of the equilateral triangle. Then, ultrasonic generator D located at position ⑥ is turned off to release the oil fume particles suspended in the corresponding standing wave. Finally, in the ending phase, that is, upon receiving the command to turn off the range hood, each ultrasonic generator 31 is turned off.

[0124] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A range hood based on ultrasonic standing waves, characterized in that, The device includes a smoke hood (10) and an ultrasonic standing wave device (20). The smoke hood (10) is provided with an air inlet (11), and the ultrasonic standing wave device (20) is located on the air inlet side of the air inlet (11). The ultrasonic standing wave device (20) includes: An ultrasonic generating mechanism (30) includes multiple ultrasonic generators (31) and a moving mechanism; The reflective mechanism (40) is opposite to the ultrasonic generator (31) and located on opposite sides of the air intake airflow of the air inlet (11); The ultrasonic generator (31) is used to emit ultrasonic waves, and the reflection mechanism (40) is used to reflect the ultrasonic waves and form a standing wave to gather the oil fume particles in the air intake airflow and suspend them. The moving mechanism is used to drive the ultrasonic generator (31) to move along a preset circumferential trajectory (33) in the moving plane (32). The moving plane (32) is parallel to the airflow direction of the air inlet (11). A plurality of position points are provided on the preset circumferential trajectory (33), and the number of position points is equal to the number of ultrasonic generators (31). The location points include a first location point and a second location point; in the direction of airflow, the first location point is located on the side of the second location point away from the air inlet (11).

2. The range hood according to claim 1, characterized in that, The preset circumferential trajectory (33) is circular or elliptical, and the multiple position points are evenly distributed on the circumference.

3. The range hood according to claim 2, characterized in that, The number of the location points is odd, and the multiple location points are symmetrically distributed along an axis, with the extension direction of the axis of symmetry (35) parallel to the direction of the airflow.

4. The range hood according to claim 1, characterized in that, The preset circumferential trajectory (33) is polygonal, and the position points are distributed at the vertices of the polygon.

5. The range hood according to claim 4, characterized in that, The preset circumferential trajectory (33) is an equilateral triangle, which includes a first side (361), a second side (362), and a third side (363) connected end to end. The extension direction of the first side (361) is perpendicular to the airflow direction. In the airflow direction, the second side (362) and the third side (363) are both located on the side of the first side (361) away from the air inlet (11).

6. The range hood according to claim 1, characterized in that, The first position point is the position point that is farthest from the air inlet (11) in the direction of airflow flow among the plurality of position points, and / or the second position point is the position point that is closest to the air inlet (11) in the direction of airflow flow among the plurality of position points.

7. A control method for a range hood based on ultrasonic standing waves, characterized in that, Applied to the ultrasonic standing wave-based range hood as described in any one of claims 1-6; the control method includes multiple normal cycle stages, any one of the normal cycle stages including: Turn on the ultrasonic generator (31) located at the first position point to emit ultrasonic waves through the ultrasonic generator (31) and reflect them through the reflection mechanism (40) to form a standing wave that gathers the oil fume particles in the incoming airflow and suspends them; turn off the ultrasonic generator (31) located at the second position point to release the oil fume particles suspended in the corresponding standing wave. Real-time monitoring of the amount of oil fumes suspended in the standing wave corresponding to the first location point; When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives each of the ultrasonic generators (31) to move synchronously from one position point to the next position point along the preset circumferential trajectory (33).

8. The control method according to claim 7, characterized in that, Prior to the plurality of normal cycle phases, the following is also included: Get the operating setting of the range hood; Based on the operating gear, determine the step movement time required for the ultrasonic generator (31) to move from one position point to the next position point during the normal cycle phase; When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives each of the ultrasonic generators (31) to move synchronously from one position point to the next position point along the preset circumferential trajectory (33), including: When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive each ultrasonic generator (31) to move synchronously from one position point to the next position point along the preset circumferential trajectory (33) within the stepping movement time.

9. The control method according to claim 8, characterized in that, The operating gears include a first gear and a second gear, wherein the operating power of the first gear is greater than the operating power of the second gear. Based on the operating gear, determine the step movement time required for the ultrasonic generator (31) to move from one position point to the next position point during the normal cycle phase, including: When the operating gear is the first gear, the step movement time required for the ultrasonic generator (31) to move from one position point to the next position point in the normal cycle phase is determined as the first movement time T1; When the operating gear is the second gear, the step movement time required for the ultrasonic generator (31) to move from one position point to the next position point in the normal cycle phase is determined as the second movement time T2; where T1 < T2.

10. The control method according to claim 8, characterized in that, Based on the operating gear, after determining the step movement time required for the ultrasonic generator (31) to move from one position point to the next position point during the normal cycle phase, the process further includes: Based on the distance between each position point and the next position point on the preset circumferential trajectory (33) and the stepping movement time, determine the speed required for the ultrasonic generator (31) that is stationary at each position point to move to the next position point. When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive each of the ultrasonic generators (31) to move synchronously from one position point to the next position point along the preset circumferential trajectory (33) within the stepping movement time, including: When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive each ultrasonic generator (31) at the speed required to move from one position point to the next position point along the preset circumferential trajectory (33).

11. The control method according to claim 7, characterized in that, The control method further includes an end phase, which, in the time dimension, is located after the normal cycle phase; The termination phase includes: Upon receiving a command to turn off the range hood, each of the ultrasonic generators (31) is turned off.

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