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 two ultrasonic wave generators and moving mechanism;Reflection mechanism is opposite with ultrasonic wave generator and respectively located in the opposite sides of the air flow of inlet air inlet;Ultrasonic wave generator is used to emit ultrasonic wave, reflection mechanism is used to reflect ultrasonic wave and form standing wave, to gather the oil fume particle in air flow and make it suspend;Moving mechanism is used to drive ultrasonic wave generator to move along preset circumferential trajectory in moving plane, moving plane is parallel with the flowing direction of air flow of inlet air inlet, and two position points are arranged on preset circumferential trajectory.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 includes two 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. There are two position points set on the preset circumferential trajectory.

[0010] The two 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, elliptical, or polygonal, with the position points evenly distributed on the preset circumferential trajectory.

[0012] Optionally, the preset circumferential trajectory is a square, with the first position point and the second position point located at two opposite vertices of the square.

[0013] Optionally, the first position point is the position point farthest from the air inlet in the direction of airflow in the preset circumferential trajectory, and / or the second position point is the position point closest to the air inlet in the direction of airflow in the preset circumferential trajectory.

[0014] Secondly, embodiments of the present invention also provide a control method for a range hood based on ultrasonic standing waves, which is applied to a range hood based on ultrasonic standing waves as described in any of the first aspects.

[0015] For any ultrasonic generator, the control method includes multiple normal cycle phases, and the normal cycle phases of two ultrasonic generators are executed alternately with overlap at the beginning and end.

[0016] Any normal cycle phase of any ultrasonic generator includes a collection sub-phase and a cyclic movement sub-phase;

[0017] The collection sub-phase includes:

[0018] Turn on the ultrasonic generator located at the first position point so that the ultrasonic waves emitted by the ultrasonic generator and reflected by the reflection mechanism form a standing wave that gathers the oil fume particles in the incoming airflow and suspends them.

[0019] The amount of oil fumes suspended in the standing wave corresponding to the first location point is monitored in real time until the amount of oil fumes suspended in the standing wave corresponding to the first location point reaches the preset value.

[0020] The cyclic shift sub-phase includes:

[0021] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven by the moving mechanism to move away from the first position point along a preset circumferential trajectory in a way that first accelerates and then decelerates uniformly until it moves back to the first position point.

[0022] Specifically, the ultrasonic generator is turned off when it moves to the second position point to release the oil fume particles suspended in the corresponding standing wave; in the time dimension, in two adjacent and overlapping normal cycle stages, the collection sub-stage in the later-executed normal cycle stage is located within the cycle movement sub-stage in the earlier-executed normal cycle stage.

[0023] Optionally, prior to multiple normal cycle phases, the following may also be included:

[0024] Get the operating setting of the range hood;

[0025] Based on the operating gear, determine the step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase;

[0026] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven by a moving mechanism to move along a preset circumferential trajectory from the first position point in a manner of first uniform acceleration and then uniform deceleration, until it moves back to the first position point, including:

[0027] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives the ultrasonic generator to move along a preset circumferential trajectory from the first position point in a moving manner with uniform acceleration followed by uniform deceleration within the stepping movement time, until it moves back to the first position point.

[0028] 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;

[0029] Based on the operating speed, determine the step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase, including:

[0030] When the operating gear is the first gear, the stepping time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase is determined as the first movement time T1.

[0031] When the operating gear is the second gear, the stepping time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase is determined as the second movement time T2; where T1 < T2.

[0032] Optionally, after determining the step movement time required for the ultrasonic generator to move one revolution along a preset circumferential trajectory during the normal cycle phase, based on the operating gear, the method further includes:

[0033] Based on the determined step movement time and the distance from leaving the first position point to returning to the first position point along the preset circumferential trajectory, set the first acceleration a1 and the first time Ta1 during the acceleration process, and the second acceleration a2 and the second time Ta2 during the deceleration process; where a1 > 0 and a2 < 0.

[0034] 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 the ultrasonic generator to move along a preset circumferential trajectory from the first position point in a stepping movement time, with a movement mode of first uniform acceleration and then uniform deceleration, until the movement returns to the first position point, including:

[0035] 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 the ultrasonic generator to move along the preset circumferential trajectory with a first acceleration a1 within the first time Ta1.

[0036] During the second time Ta2, the ultrasonic generator is driven to move along a preset circumferential trajectory with a second acceleration a2 at a uniform deceleration until it returns to the first position point.

[0037] Alternatively, |a1|≤|a2|.

[0038] Optionally, the control method also includes a preparation phase and a preliminary cycle phase. In terms of time, the preliminary cycle phase precedes the normal cycle phase, and the preparation phase precedes the preliminary cycle phase.

[0039] The preparation phase includes:

[0040] The ultrasonic generator is moved by a moving mechanism so that an ultrasonic generator is stationed at both the first and second position points.

[0041] The initial cycle phase includes:

[0042] The ultrasonic generator located at the second position point is driven by a moving mechanism to move from the second position point to the first position point along a preset circumferential trajectory in a moving manner of first uniform acceleration and then uniform deceleration.

[0043] The preliminary cycle phase overlaps with the first normal cycle phase, and the collection sub-phase in the first normal cycle phase is located within the preliminary cycle phase.

[0044] Optionally, a moving mechanism is used to drive an ultrasonic generator located at a second position point to move from the second position point to the first position point along a preset circumferential trajectory in a movement pattern of first uniform acceleration and then uniform deceleration, including:

[0045] Using a moving mechanism, within the stepping movement time, the ultrasonic generator located at the second position point is driven to move from the second position point to the first position point along a preset circumferential trajectory in a movement mode of first uniform acceleration and then uniform deceleration.

[0046] Optionally, after determining the step movement time required for the ultrasonic generator to move one revolution along a preset circumferential trajectory during the normal cycle phase, based on the operating gear, the method further includes:

[0047] Based on the determined step movement time and the distance traveled from the second position point to the first position point along the preset circumferential trajectory, the third acceleration a3 and the third time Ta3 during the acceleration process and the fourth acceleration a4 and the fourth time Ta4 during the deceleration process are set; where a3 > 0 and a4 < 0.

[0048] 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 the ultrasonic generator to move along a preset circumferential trajectory from the first position point in a stepping movement time, with a movement mode of first uniform acceleration and then uniform deceleration, until the movement returns to the first position point, including:

[0049] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven to move along the preset circumferential trajectory with a third acceleration a3 within the third time Ta3 using the moving mechanism.

[0050] Within the fourth time period Ta4, the ultrasonic generator is driven to move along a preset circumferential trajectory with a fourth acceleration a4 until it returns to the first position point.

[0051] Optionally, the control method also includes an end phase, which, in the time dimension, is located after the normal cycle phase;

[0052] The final stage includes:

[0053] Upon receiving a command to turn off the range hood, all ultrasonic generators are turned off, and a moving mechanism is used to drive each ultrasonic generator to move to a preset initial position point on a preset circumferential trajectory.

[0054] 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 two ultrasonic wave generators and a moving mechanism. The reflecting mechanism is opposite to the ultrasonic wave generators and is located on opposite sides of the air inlet. The ultrasonic wave 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 wave generators to move along a preset circumferential trajectory in a moving plane. The moving plane is parallel to the air inlet airflow direction. Two position points are set on the preset circumferential trajectory. The two 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. Attached Figure Description

[0055] 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;

[0056] Figure 2 This is a schematic diagram of another range hood based on ultrasonic standing waves provided in an embodiment of the present invention;

[0057] 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;

[0058] Figure 4 This is a schematic diagram of the structure of an ultrasonic generating mechanism provided in an embodiment of the present invention;

[0059] Figure 5 This is a flowchart illustrating a control method for a range hood based on ultrasonic standing waves provided in an embodiment of the present invention.

[0060] Figure 6 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;

[0061] Figure 7 This is a schematic diagram of the speed-time relationship of a control method for a range hood based on ultrasonic standing waves provided in an embodiment of the present invention;

[0062] Figure 8 yes Figure 4 The diagram shows another type of ultrasonic generator.

[0063] Figure 9 This is a time-dimensional schematic diagram of another control method for a range hood based on ultrasonic standing waves provided in an embodiment of the present invention;

[0064] 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.

[0065] 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;

[0066] 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;

[0067] 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;

[0068] Figure 14This is a time-dimensional schematic diagram of another control method for a range hood based on ultrasonic standing waves provided in an embodiment of the present invention;

[0069] Figure 15 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.

[0070] Explanation of reference numerals in the attached figures:

[0071] 10-Smoke hood; 11-Air inlet;

[0072] 20 - Ultrasonic standing wave device;

[0073] 30-Ultrasonic generating mechanism; 31-Ultrasonic generator; 32-Moving plane; 33-Preset circumferential trajectory; 34-Energy storage device;

[0074] 40 - Reflection mechanism. Detailed Implementation

[0075] 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.

[0076] 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 reflection mechanism 40. The ultrasonic wave generating mechanism 30 includes two 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 ultrasonic waves and form standing waves to gather 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 two position points are provided on the preset circumferential trajectory 33; the two position points include a first position point and a second position point, and 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.

[0077] Specifically, the ultrasonic standing wave device 20 includes an ultrasonic generating mechanism 30 and a reflecting mechanism 40. The ultrasonic generating mechanism 30 includes two 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.

[0078] 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.

[0079] The movable plane 32 is parallel to the airflow direction X of the air inlet 11. Two ultrasonic generators 31 are disposed on the movable plane 32 and can move along a preset circumferential trajectory 33. The preset circumferential trajectory 33 has two position points: 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 the movable mechanism drives an ultrasonic generator 31 to move from the first position point to the second position point, 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. Since the second position point is closer to the air inlet 11, the standing wave formed between the ultrasonic generator 31 and the reflecting mechanism 40 can move suspended oil fume particles in the airflow towards the air inlet 11, facilitating the subsequent absorption of these particles into the range hood.

[0080] 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 wave generating mechanism and a reflecting mechanism. The ultrasonic wave generating mechanism includes two ultrasonic wave generators and a moving mechanism. The reflecting mechanism is opposite to the ultrasonic wave generators and is located on opposite sides of the air inlet. The ultrasonic wave 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 wave generators to move along a preset circumferential trajectory in a moving plane. The moving plane is parallel to the air inlet airflow direction. Two position points are set on the preset circumferential trajectory. The two 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.

[0081] Optionally, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the preset circumferential trajectory 33 is circular, elliptical, or polygonal, and the position points are evenly distributed on the preset circumferential trajectory 33.

[0082] 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, elliptical, or polygonal (for example, polygons include triangles, quadrilaterals (for example, quadrilaterals include squares, rectangles, trapezoids, etc.), pentagons, etc.). If two position points are evenly distributed on the preset circumferential trajectory 33, the moving mechanism can be used to drive the ultrasonic generator 31 to move along the preset circumferential trajectory 33. It should be noted that... Figure 4 The shape of the preset circumferential trajectory 33 shown is merely an example and is not intended to be limiting.

[0083] Optionally, continue to refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The preset circumferential trajectory 33 is a square, with the first position point and the second position point located at the two opposite vertices of the square.

[0084] For example, Figure 4 The preset circumferential trajectory 33 shown is square, and two position points are set on the preset circumferential trajectory 33, namely position point ① and position point ②. 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. Therefore, position point ① can be the first position point, and position point ② can be the second position point. In one embodiment, the first position point and the second position point are respectively located at two opposite vertices of the square. Figure 4 The two points shown are located at the top left and bottom right vertices of the square, respectively. Alternatively, the two points could also be located at the bottom left and top right vertices of the square, respectively.

[0085] Optionally, continue to refer to Figure 1 , Figure 2 and Figure 4 The first position point is the position point farthest from the air inlet 11 in the air inlet airflow direction X of the preset circumferential trajectory 33, and / or the second position point is the position point closest to the air inlet 11 in the air inlet airflow direction X of the preset circumferential trajectory 33.

[0086] Specifically, two 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 in the middle can be position point ①, which is the position point farthest from the air inlet 11 in the air inlet airflow direction X in the preset circumferential trajectory 33; Figure 4 The second position point can be position point ②, which is the position point closest to the air inlet 11 in the air inlet airflow direction X in the preset circumferential trajectory 33.

[0087] 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 5 , Figure 6 and Figure 7 As shown, for any ultrasonic generator, the control method includes multiple normal cycle stages, and the normal cycle stages of two ultrasonic generators are executed alternately with overlapping beginnings and ends; any normal cycle stage of any ultrasonic generator includes a collection sub-stage and a cyclic movement sub-stage; wherein, the collection sub-stage and the cyclic movement sub-stage include:

[0088] S110. Turn on the ultrasonic generator located at the first position point, so that the ultrasonic waves emitted by the ultrasonic generator and reflected by the reflection mechanism form a standing wave that gathers the oil fume particles in the incoming airflow and suspends them.

[0089] Specifically, during the collection sub-stage, continue to refer to Figure 1 and Figure 2 Of the two positions set on the preset circumferential trajectory 33, the first position is located on the side of the second position away from the air inlet 11 in the airflow direction X. That is, in the airflow direction 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 airflow direction 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, it begins to emit ultrasonic waves. During propagation, the ultrasonic waves are reflected by the reflection mechanism 40, changing their propagation direction. Two ultrasonic waves with the same frequency but opposite transmission 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. Oil fume particles within this standing wave field are suspended due to the influence of sound radiation force, thus using the standing wave to collect the oil fume particles in the airflow. When the ultrasonic generator 31 located at the first position point is turned on, and the ultrasonic generator 31 is closer to the stove, the ultrasonic generator 31 can gather the oil fume particles above the stove, preventing the oil fume particles from accelerating and escaping during the rising process.

[0090] S120. Monitor the amount of oil fumes suspended in the standing wave corresponding to the first position point in real time until the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches the preset value.

[0091] The preset values ​​can be determined based on the cooking status and performance of the range hood. Specifically, in the collection sub-stage, continue to refer to... Figure 1 and Figure 2 The 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 gas sensor, and the real-time monitored amount of oil fume can be compared with a preset value. For example, the monitoring principle of oil fume amount includes 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, etc., and transmits the collected oil fume gas to a sieve sensor with multiple pores. After 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.

[0092] S130. When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven by the moving mechanism to move along a preset circumferential trajectory from the first position point in a moving manner of first uniform acceleration and then uniform deceleration, until it moves back to the first position point; wherein, the ultrasonic generator is turned off when it moves to the second position point to release the oil fume particles suspended in the corresponding standing wave; in the time dimension, in two adjacent and overlapping normal cycle stages, the collection sub-stage in the later-executed normal cycle stage is located within the cyclic movement sub-stage in the earlier-executed normal cycle stage.

[0093] Specifically, in the cyclic move sub-phase, with Figure 4 For example, Figure 4The moving plane 32 includes two ultrasonic generators 31, namely ultrasonic generator A and ultrasonic generator B. The preset circumferential trajectory 33 on the moving plane 32 is square, and two position points are set on the preset circumferential trajectory 33, namely position point ① and position point ②. At the current normal cycle time, ultrasonic generator A is located at position point ①, and ultrasonic generator B is located at position point ②. Figure 4 The first position point can be position point ①, and the second position point can be position point ②. When the ultrasonic generator A at position point ① is turned on, and the amount of oil fume suspended in the corresponding standing wave at position point ① reaches a preset value, the ultrasonic generator A can be driven by a moving mechanism to move along the preset circumferential trajectory 33 of the square from position point ① in a manner of first uniform acceleration and then uniform deceleration, until it returns to position point ①. That is, the ultrasonic generator A is driven by the moving mechanism to move one full circle along the preset circumferential trajectory 33 of the square. Furthermore, during the process of the ultrasonic generator A moving along the preset circumferential trajectory 33 of the square using the moving mechanism, when the ultrasonic generator A moves to position point ②, the ultrasonic generator A is turned off. At this time, the ultrasonic generator A is closer to the range hood, and it can release the oil fume particles suspended in the corresponding standing wave, which is beneficial for the oil fume particles to be sucked into the range hood by the air inlet 11.

[0094] Secondly, continue to refer to Figure 6 and Figure 7 For any ultrasonic generator 31, the control method includes multiple normal cycle stages. Each normal cycle stage of any ultrasonic generator 31 includes a collection sub-stage and a cyclic movement sub-stage. In the time dimension, the collection sub-stage precedes the cyclic movement sub-stage in any normal cycle stage of any ultrasonic generator 31. In one embodiment, the normal cycle stages of two ultrasonic generators 31 (exemplarily, ultrasonic generator A and ultrasonic generator B) are executed alternately with overlapping beginnings and ends. In the time dimension, in two adjacent and overlapping normal cycle stages, the collection sub-stage in the later-executed normal cycle stage is located within the cyclic movement sub-stage in the earlier-executed normal cycle stage. This ensures that the ultrasonic generator 31 corresponding to the earlier-executed normal cycle stage leaves the first position point before the ultrasonic generator 31 corresponding to the later-executed normal cycle stage reaches the first position point, or that the ultrasonic generator 31 corresponding to the later-executed normal cycle stage has already left before the ultrasonic generator 31 corresponding to the earlier-executed normal cycle stage reaches the first position point. For example, Figure 8 yes Figure 4The diagram illustrates how, after a normal cycle, ultrasonic generators A and B are moved along a preset circumferential trajectory 33 using a moving mechanism. In the time dimension, the normal cycle phases corresponding to ultrasonic generator A and B are adjacent, and the cyclic movement sub-phase of the normal cycle phase for ultrasonic generator A overlaps with the collection sub-phase of the normal cycle phase for ultrasonic generator B. For example, when ultrasonic generator A is turned on at position ① and the amount of oil fume suspended in the standing wave corresponding to position ① reaches a preset value, ultrasonic generator A can be driven by the moving mechanism to move along the preset circumferential trajectory 33 of the square, moving away from position ① with a uniform acceleration followed by uniform deceleration. Simultaneously, ultrasonic generator B is also driven by the moving mechanism to move along the preset circumferential trajectory 33 to position ① and is turned on. The ultrasonic waves emitted by ultrasonic generator B and reflected by the reflection mechanism 40 form a standing wave that collects the oil fume particles in the incoming airflow, suspending them. It is understandable that when the ultrasonic generator B is moved along the preset circumferential trajectory 33 to position ① using the moving mechanism, the ultrasonic generator A can be located at position ②, or at any point on the preset circumferential trajectory 33 between position ① and position ②. Furthermore, in Figure 8 During the next movement, ultrasonic generator A moves from position point ② to position point ① along the preset circumferential trajectory 33, and ultrasonic generator B moves from position point ① to position point ② along the preset circumferential trajectory 33. Figure 4 and Figure 8 The corresponding normal cycle phases all move in a square pattern.

[0095] The technical solution in this embodiment of the invention first activates the ultrasonic generator located at the first position point. The ultrasonic generator emits ultrasonic waves, which are reflected by a reflection mechanism to form a standing wave that gathers and suspends oil fume particles in the incoming airflow. Then, the amount of oil fume suspended in the standing wave corresponding to the first position point is monitored in real time until it reaches a preset value. Finally, when the amount of oil fume suspended in the standing wave corresponding to the first position point reaches the preset value, a moving mechanism drives the ultrasonic generator to move along a preset circumferential trajectory from the first position point in a manner of first uniform acceleration and then uniform deceleration, until it returns to the first position point. The ultrasonic generator is deactivated when it reaches the second position point to release the oil fume particles suspended in the corresponding standing wave. In the time dimension, in two adjacent and overlapping normal cycle stages, the collection sub-stage in the later-executed normal cycle stage is located within the cyclic movement sub-stage in the earlier-executed normal cycle stage. Using the above method, an ultrasonic standing wave is formed by an ultrasonic standing wave device. The ultrasonic standing wave can gather the oil fume particles in the incoming airflow and suspend them. It can be turned on and off according to the movement position of the ultrasonic generator, which achieves the effects of gathering oil fumes, reducing the speed of oil fumes, reducing the activity of oil fumes, and driving oil fumes to be transmitted into the range hood. This prevents oil fume particles from accelerating and diffusing during the rising process and escaping without entering the range hood, thereby improving the smoke extraction effect of the range hood and effectively improving the user's cooking experience.

[0096] 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: when receiving the instruction to turn off the range hood, turning off each ultrasonic generator, and using a moving mechanism to drive each ultrasonic generator to move to the corresponding preset initial position point on the preset circumferential trajectory.

[0097] The preset initial position can be determined based on the position of the ultrasonic standing wave device after the range hood is turned off. Specifically, the control method includes multiple normal cycle stages and an end stage, with the end stage following the normal cycle stages in time. The normal cycle stage utilizes the standing wave formed by the ultrasonic standing wave device to gather and suspend oil fume particles in the incoming airflow, and then appropriately releases the suspended oil fume particles from the corresponding standing wave. The end stage can be the cooking end stage, where, upon receiving a command to turn off the range hood, each ultrasonic generator in the ultrasonic standing wave device is turned off, and a moving mechanism drives each ultrasonic generator to move to a preset initial position point on a preset circumferential trajectory. This preset initial position point can be any one of two positions. Figure 4For example, the moving plane 32 includes two ultrasonic generators 31, namely ultrasonic generator A and ultrasonic generator B. Before receiving the command to turn off the range hood, ultrasonic generator A is located at position point ①, and ultrasonic generator B is located at position point ②. The preset initial position point corresponding to ultrasonic generator A on the preset circumferential trajectory 33 can be position point ①, and the preset initial position point corresponding to ultrasonic generator B on the preset circumferential trajectory 33 can be position point ②. Therefore, after receiving the command to turn off the range hood, ultrasonic generators A and B can remain in their original positions without using the moving mechanism. Alternatively, ultrasonic generator A can be located at position point ② on the preset circumferential trajectory 33, and ultrasonic generator B can be located at position point ①. Then, after receiving the command to turn off the range hood, ultrasonic generator A can be moved from position point ① to position point ② using the moving mechanism, and ultrasonic generator B can be moved from position point ② to position point ① using the moving mechanism. It should be noted that, Figure 4 The diagram shows only the correspondence between the ultrasonic generator 31 and the position point, and does not limit the direction and process of the movement mechanism driving the ultrasonic generator 31.

[0098] 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:

[0099] Get the operating setting of the range hood;

[0100] Based on the operating gear, determine the step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase;

[0101] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven by a moving mechanism to move along a preset circumferential trajectory from the first position point in a manner of first uniform acceleration and then uniform deceleration, until it moves back to the first position point, including:

[0102] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives the ultrasonic generator to move along a preset circumferential trajectory from the first position point in a moving manner with uniform acceleration followed by uniform deceleration within the stepping movement time, until it moves back to the first position point.

[0103] For details not covered in this embodiment, please refer to the above embodiments. Figure 10 As shown, the control method includes:

[0104] S210: Obtain the operating setting of the range hood.

[0105] 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.

[0106] S220. Based on the operating gear, determine the step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase.

[0107] 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-by-step movement time required for the ultrasonic generator to move one revolution along a preset circumferential trajectory during the normal cycle phase is determined, including: when the operating gear is the first gear, the step-by-step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase is determined as the first movement time T1; when the operating gear is the second gear, the step-by-step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase is determined as the second movement time T2; wherein, T1 < T2.

[0108] 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 level, and the second level can be a low level. The high level corresponds to a higher concentration of oil fumes, resulting in greater diffusion and escape of oil fume particles during their ascent. Therefore, the first movement time T1 is the step time required for the ultrasonic generator to complete one revolution along a preset circumferential trajectory during normal operation. The first movement time T1 needs to be relatively small, meaning that the oil fume particles can be collected and released in a shorter time. The low level corresponds to a lower concentration of oil fumes, resulting in less diffusion and escape of oil fume particles during their ascent. Therefore, the second movement time T2 is the step time required for the ultrasonic generator to complete one revolution along a preset circumferential trajectory during normal operation. The second movement time T2 can be relatively large, meaning that the oil fume particles can be collected and released over a longer period.

[0109] S230. Turn on the ultrasonic generator located at the first position point, so that the ultrasonic waves emitted by the ultrasonic generator and reflected by the reflection mechanism form a standing wave that gathers the oil fume particles in the incoming airflow and suspends them.

[0110] S240: Monitor the amount of oil fumes suspended in the standing wave corresponding to the first position point in real time until the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches the preset value.

[0111] 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 the ultrasonic generator to move along the preset circumferential trajectory from the first position point in a moving manner of first uniform acceleration and then uniform deceleration within the stepping movement time, until the movement returns to the first position point.

[0112] Specifically, with Figure 4 For example, Figure 4 The moving plane 32 includes two ultrasonic generators 31, namely ultrasonic generator A and ultrasonic generator B. The preset circumferential trajectory 33 on the moving plane 32 is square, and two position points are set on the preset circumferential trajectory 33, namely position point ① and position point ②. Figure 4The first position point can be position point ①. At the current normal cycle time, ultrasonic generator A is located at position point ①, and ultrasonic generator B is located at position point ②. When the amount of oil fume suspended in the standing wave corresponding to position point ① reaches a preset value, a moving mechanism can be used to drive ultrasonic generator A to move along a preset circumferential trajectory 33 from position point ① in a step-moving manner, first with uniform acceleration and then with uniform deceleration, until it returns to position point ①. This step-moving time is related to the time it takes for ultrasonic generator B to move from one position point to position point ① in the subsequent normal cycle phase, and the collection sub-phase at position point ① for ultrasonic generator B. This step-moving time needs to be large enough to ensure that during the movement of ultrasonic generator A driven by the moving mechanism, the amount of oil fume suspended in the corresponding standing wave of ultrasonic generator B at position point ① reaches the preset value.

[0113] 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:

[0114] Get the operating setting of the range hood;

[0115] Based on the operating gear, determine the step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase;

[0116] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven by a moving mechanism to move along a preset circumferential trajectory from the first position point in a manner of first uniform acceleration and then uniform deceleration, until it moves back to the first position point, including:

[0117] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives the ultrasonic generator to move along a preset circumferential trajectory from the first position point in a moving manner with uniform acceleration followed by uniform deceleration within the stepping movement time, until it moves back to the first position point.

[0118] Furthermore, after determining the step movement time required for the ultrasonic generator to move one revolution along a preset circumferential trajectory during the normal cycle phase, based on the operating gear, the process also includes:

[0119] Based on the determined step movement time and the distance from leaving the first position point to returning to the first position point along the preset circumferential trajectory, set the first acceleration a1 and the first time Ta1 during the acceleration process, and the second acceleration a2 and the second time Ta2 during the deceleration process; where a1 > 0 and a2 < 0.

[0120] 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 the ultrasonic generator to move along a preset circumferential trajectory from the first position point in a stepping movement time, with a movement mode of first uniform acceleration and then uniform deceleration, until the movement returns to the first position point, including:

[0121] 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 the ultrasonic generator to move along the preset circumferential trajectory with a first acceleration a1 within the first time Ta1.

[0122] During the second time Ta2, the ultrasonic generator is driven to move along a preset circumferential trajectory with a second acceleration a2 at a uniform deceleration until it returns to the first position point.

[0123] For details not covered in this embodiment, please refer to the above embodiments. Figure 11 As shown, the control method includes:

[0124] S310: Obtain the operating setting of the range hood.

[0125] S320. Based on the operating gear, determine the step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase.

[0126] S330. Based on the determined step movement time and the distance from leaving the first position point to moving back to the first position point along the preset circumferential trajectory, set the first acceleration a1 and the first time Ta1 during the acceleration process and the second acceleration a2 and the second time Ta2 during the deceleration process; wherein, a1>0, a2<0.

[0127] Specifically, with Figure 4 , Figure 7 and Figure 8 For example, Figure 4 This can be understood as ultrasonic generator A being in the collection sub-phase within the previously executed normal cycle phase. Figure 8This can be understood as ultrasonic generator A being in the cyclic movement sub-phase of the previously executed normal cycle phase, and ultrasonic generator B being in the collection sub-phase of the subsequently executed normal cycle phase. For example, during the process of driving ultrasonic generator A to move once along a preset circumferential trajectory 33 using a moving mechanism, the distance from leaving position point ① to returning to position point ① along the preset circumferential trajectory 33 of the square is L1, where L1 is the perimeter of the square. Based on the operating gear, the step movement time required for ultrasonic generator A to move once along the preset circumferential trajectory 33 during the normal cycle phase can be T. To enable ultrasonic generator A to leave position point ①, move once along the preset circumferential trajectory 33, and then return and remain at position point ①, ultrasonic generator A can be set to start from zero velocity and first undergo uniform acceleration (the first acceleration during acceleration is a1, and a1 > 0), followed by uniform deceleration (the second acceleration during deceleration is a2, a2 ​​< 0) until the velocity reaches zero. It is understandable that the transition point between uniformly accelerated motion and uniformly decelerated motion corresponds to a maximum velocity V1, where V1 = a1 × Ta1, and Ta1 can be understood as the time required for the uniformly accelerated motion process; V1 = a2 × Ta2, and Ta2 can be understood as the time required for the uniformly decelerated motion process. a1 and a2 are simply opposite in sign; the absolute values ​​of a1 and a2 are not limited here, and can be equal or unequal. In one embodiment, optionally, |a1| ≤ |a2|.

[0128] S340. Turn on the ultrasonic generator located at the first position point, so that the ultrasonic waves emitted by the ultrasonic generator and reflected by the reflection mechanism form a standing wave that gathers the oil fume particles in the incoming airflow and suspends them.

[0129] S350: Real-time monitoring of the amount of oil fumes suspended in the standing wave corresponding to the first position point until the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches the preset value.

[0130] S360 When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven to move along the preset circumferential trajectory with a first acceleration a1 within the first time Ta1 using the moving mechanism.

[0131] Specifically, with Figure 4 For example, Figure 4 The moving plane 32 includes two ultrasonic generators 31, namely ultrasonic generator A and ultrasonic generator B. At the current normal cycle time, ultrasonic generator A is located at position point ① and ultrasonic generator B is located at position point ②. Figure 4The first position point can be position point ①, and the second position point can be position point ②. When the ultrasonic generator A at position point ① is turned on, and the amount of oil fume suspended in the standing wave corresponding to position point ① reaches a preset value, a moving mechanism can be used to drive the ultrasonic generator A away from position point ① within a first time interval Ta1, moving it along a preset circumferential trajectory 33 with a first acceleration a1. For example, Ta1 can be 1-3 seconds.

[0132] S370. Using the moving mechanism, within the second time Ta2, drive the ultrasonic generator to move along a preset circumferential trajectory with a second acceleration a2 at a uniform deceleration until it returns to the first position point.

[0133] Specifically, please refer to Figure 4 , Figure 7 and Figure 8 After the uniformly accelerated movement, the ultrasonic generator A is driven to continue moving along the preset circumferential trajectory 33 with a second acceleration a2 within a second time period Ta2, using the moving mechanism, until the movement returns to position point ①. For example, Ta2 can be 3-4 seconds.

[0134] 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:

[0135] Get the operating setting of the range hood;

[0136] Based on the operating gear, determine the step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase;

[0137] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven by a moving mechanism to move along a preset circumferential trajectory from the first position point in a manner of first uniform acceleration and then uniform deceleration, until it moves back to the first position point, including:

[0138] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives the ultrasonic generator to move along a preset circumferential trajectory from the first position point in a moving manner with uniform acceleration followed by uniform deceleration within the stepping movement time, until it moves back to the first position point.

[0139] Furthermore, the control method also includes a preparation phase and a preliminary cycle phase. In terms of time, the preliminary cycle phase precedes the normal cycle phase, and the preparation phase precedes the preliminary cycle phase.

[0140] The preparation phase includes:

[0141] The ultrasonic generator is moved by a moving mechanism so that an ultrasonic generator is stationed at both the first and second position points.

[0142] The initial cycle phase includes:

[0143] The ultrasonic generator located at the second position point is driven by a moving mechanism to move from the second position point to the first position point along a preset circumferential trajectory in a moving manner of first uniform acceleration and then uniform deceleration; wherein, the preliminary cycle stage overlaps with the first normal cycle stage, and the collection sub-stage in the first normal cycle stage is located within the preliminary cycle stage.

[0144] For details not covered in this embodiment, please refer to the above embodiments. Figure 12 As shown, the control method includes:

[0145] S410: Obtain the operating setting of the range hood.

[0146] S420. Based on the operating gear, determine the step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase.

[0147] S430. The ultrasonic generator is moved by a moving mechanism so that an ultrasonic generator is stationary at both the first position point and the second position point.

[0148] Specifically, please refer to Figure 6 This control method includes a preparation phase, a preliminary cycle phase, and multiple normal cycle phases. In terms of time, the preliminary cycle phase precedes the normal cycle phase, and the preparation phase precedes the preliminary cycle phase. Figure 4 For example, Figure 4 The moving plane 32 includes two ultrasonic generators 31, namely ultrasonic generator A and ultrasonic generator B. The preset circumferential trajectory 33 on the moving plane 32 has two position points, namely position point ① and position point ②. Figure 4 The first position point can be position point ①, and the second position point can be position point ②. During the preparation stage, a moving mechanism can be used to drive ultrasonic generator A and ultrasonic generator B to move so that an ultrasonic generator 31 is stationed at both position point ① and position point ②. For example, if ultrasonic generator A is stationed at position point ①, then ultrasonic generator B is stationed at position point ②, or if ultrasonic generator B is stationed at position point ①, then ultrasonic generator A is stationed at position point ②.

[0149] S440. The ultrasonic generator located at the second position point is driven by the moving mechanism to move from the second position point to the first position point along a preset circumferential trajectory in a moving manner of first uniform acceleration and then uniform deceleration; wherein, the preliminary cycle stage overlaps with the first normal cycle stage, and the collection sub-stage in the first normal cycle stage is located within the preliminary cycle stage.

[0150] Specifically, please refer to Figure 6 ,by Figure 4 For example, in the initial cycle stage, the ultrasonic generator B located at position ② can be driven by a moving mechanism to move from position ② to position ① along a preset circumferential trajectory 33 in a manner of first uniform acceleration and then uniform deceleration. It should be noted that, in the time dimension, the initial cycle stage precedes multiple normal cycle stages, and the initial cycle stage overlaps with the first normal cycle stage. Furthermore, the collection sub-stage of the first normal cycle stage is located within the initial cycle stage. That is, while the ultrasonic generator 31 at the second position point is in the initial cycle stage, the ultrasonic generator 31 at the first position point is in the collection sub-stage of the first normal cycle stage. For example, when ultrasonic generator B is in the initial cycle stage, ultrasonic generator B moves from position ② to position ① along the preset circumferential trajectory 33 in a manner of first uniform acceleration and then uniform deceleration. Simultaneously, ultrasonic generator A is in the collection sub-stage of the first normal cycle stage, ultrasonic generator A is activated, and a standing wave is generated at position ①. This ensures that ultrasonic generator B moves from position ② to position ① only after ultrasonic generator A leaves position ①. In terms of time, the two processes occur simultaneously, which can effectively save time and ensure the smoking effect.

[0151] Understandably, S410 and S420 determine the step movement time required for the ultrasonic generator 31 to move one revolution based on the operating setting of the range hood. In terms of time, S410 and S420 occur before the normal cycle phase, while S430 and S440 represent the preparation and initial cycle phases. Again, in terms of time, S430 and S440 occur before the normal cycle phase. Figure 12 The order shown is merely an example and is not intended to limit the process. For instance, S410 and S420, S430 and S440 can be performed simultaneously, or S410 and S420 can be performed first, followed by S430 and S440, or S430 and S440 can be performed first, followed by S410 and S420.

[0152] S450, Turn on the ultrasonic generator located at the first position point, so that the ultrasonic waves emitted by the ultrasonic generator and reflected by the reflection mechanism form a standing wave that gathers the oil fume particles in the incoming airflow and suspends them.

[0153] S460: Monitor the amount of oil fumes suspended in the standing wave corresponding to the first position point in real time until the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches the preset value.

[0154] S470 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 the ultrasonic generator to move along the preset circumferential trajectory from the first position point in a moving manner of first uniform acceleration and then uniform deceleration within the stepping movement time, until the movement returns to the first position point.

[0155] 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:

[0156] Get the operating setting of the range hood;

[0157] Based on the operating gear, determine the step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase;

[0158] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven by a moving mechanism to move along a preset circumferential trajectory from the first position point in a manner of first uniform acceleration and then uniform deceleration, until it moves back to the first position point, including:

[0159] When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism drives the ultrasonic generator to move along a preset circumferential trajectory from the first position point in a moving manner with uniform acceleration followed by uniform deceleration within the stepping movement time, until it moves back to the first position point.

[0160] Furthermore, the control method also includes a preparation phase and a preliminary cycle phase. In terms of time, the preliminary cycle phase precedes the normal cycle phase, and the preparation phase precedes the preliminary cycle phase.

[0161] The preparation phase includes:

[0162] The ultrasonic generator is moved by a moving mechanism so that an ultrasonic generator is stationed at both the first and second position points.

[0163] The initial cycle phase includes:

[0164] The ultrasonic generator located at the second position point is driven by a moving mechanism to move from the second position point to the first position point along a preset circumferential trajectory in a moving manner of first uniform acceleration and then uniform deceleration; wherein, the preliminary cycle stage overlaps with the first normal cycle stage, and the collection sub-stage in the first normal cycle stage is located within the preliminary cycle stage.

[0165] Furthermore, the ultrasonic generator located at the second position point is driven by a moving mechanism to move from the second position point to the first position point along a preset circumferential trajectory in a movement pattern of first uniform acceleration and then uniform deceleration, including:

[0166] Using a moving mechanism, within the stepping movement time, the ultrasonic generator located at the second position point is driven to move from the second position point to the first position point along a preset circumferential trajectory in a movement mode of first uniform acceleration and then uniform deceleration.

[0167] Furthermore, after determining the step movement time required for the ultrasonic generator to move one revolution along a preset circumferential trajectory during the normal cycle phase based on the operating gear, the process also includes:

[0168] Based on the determined step movement time and the distance traveled from the second position point to the first position point along the preset circumferential trajectory, the third acceleration a3 and the third time Ta3 during the acceleration process and the fourth acceleration a4 and the fourth time Ta4 during the deceleration process are set; where a3 > 0 and a4 < 0.

[0169] 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 the ultrasonic generator to move along a preset circumferential trajectory from the first position point in a stepping movement time, with a movement mode of first uniform acceleration and then uniform deceleration, until the movement returns to the first position point, including:

[0170] When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven to move along the preset circumferential trajectory with a third acceleration a3 within the third time Ta3 using the moving mechanism.

[0171] Within the fourth time period Ta4, the ultrasonic generator is driven to move along a preset circumferential trajectory with a fourth acceleration a4 until it returns to the first position point.

[0172] For details not covered in this embodiment, please refer to the above embodiments. Figure 13 As shown, the control method includes:

[0173] S510: Obtain the operating setting of the range hood.

[0174] S520. Based on the operating gear, determine the step movement time required for the ultrasonic generator to move one revolution along the preset circumferential trajectory during the normal cycle phase.

[0175] S530. Based on the determined step movement time and the distance traveled from the second position point to the first position point along the preset circumferential trajectory, set the third acceleration a3 and the third time Ta3 during the acceleration process and the fourth acceleration a4 and the fourth time Ta4 during the deceleration process; wherein, a3 > 0 and a4 < 0.

[0176] Specifically, with Figure 4 , Figure 8 and Figure 14 For example, Figure 4 This can be understood as ultrasonic generator A being in the collection sub-phase within the previously executed normal cycle phase. Figure 8 This can be understood as ultrasonic generator A being in the cyclic movement sub-phase of the previously executed normal cycle phase, and ultrasonic generator B being in the collection sub-phase of the subsequently executed normal cycle phase. It can be understood that ultrasonic generator B can only reach position ① after ultrasonic generator A is driven away from position ① by the movement mechanism. Therefore, during the collection sub-phase of ultrasonic generator A, ultrasonic generator B can be driven by the movement mechanism to move from position ② to position ① along a preset circumferential trajectory 33. For example, during the movement of ultrasonic generator B along the preset circumferential trajectory 33 from position ② to position ①, the distance from leaving position ② to moving to position ① along the preset circumferential trajectory 33 of the square is L1 / 2, where L1 is the perimeter of the square. Based on the operating mode, the step movement time required for ultrasonic generator A to move one revolution along the preset circumferential trajectory 33 during the normal cycle phase can be defined as T. To ensure that ultrasonic generator B arrives at position ① only after ultrasonic generator A has left position ①, ultrasonic generator B can be programmed to first undergo uniform acceleration (the first acceleration during acceleration is a3, and a3 > 0) starting from zero velocity, followed by uniform deceleration (the second acceleration during deceleration is a4, and a4 < 0) until its velocity reaches zero. It can be understood that the transition time between uniform acceleration and uniform deceleration corresponds to a maximum velocity V2, where V2 = a3 × Ta3, where Ta3 can be understood as the time required for the uniform acceleration process, and V1 = a4 × Ta4, where Ta4 can be understood as the time required for the uniform deceleration process. a3 and a4 are simply opposite in sign; the absolute values ​​of a3 and a4 are not fixed and can be equal or unequal.

[0177] In addition, with Figure 4 and Figure 8 For example, in the cyclic movement sub-stage of the normal cycle phase corresponding to ultrasonic generator A, the ultrasonic generator A can be driven by a moving mechanism to move along a preset circumferential trajectory 33 from position point ① in a manner of first uniform acceleration and then uniform deceleration, until it moves back to position point ①. During this process, the moving distance of ultrasonic generator A is L1, and the moving time of ultrasonic generator A is the step movement time T. In the uniform acceleration process, the first acceleration is a1 and the first time is Ta1; in the uniform deceleration process, the second acceleration is a2 and the second time is Ta2. It can be understood that T = Ta1 + Ta2. During the initial cycle phase corresponding to ultrasonic generator B, the moving mechanism can drive ultrasonic generator B to move along a preset circumferential trajectory 33 from position point ② to position point ①, using a movement mechanism that first accelerates and then decelerates uniformly. During this process, the distance traveled by ultrasonic generator B is... The movement time of ultrasonic generator B should be less than the step movement time T. For example, the movement time of ultrasonic generator B can be... In the uniform acceleration process, the third acceleration is a3 and the third time interval is Ta3; in the uniform deceleration process, the fourth acceleration is a4 and the fourth time interval is Ta4. It is understandable that... In one embodiment, optionally, a1 = 2 × a3, a2 = 2 × a4.

[0178] S540. The ultrasonic generator is moved by a moving mechanism so that an ultrasonic generator is stationary at both the first position point and the second position point.

[0179] S550. Using a moving mechanism, within the stepping movement time, the ultrasonic generator located at the second position point is driven to move from the second position point to the first position point along a preset circumferential trajectory in a movement mode of first uniform acceleration and then uniform deceleration.

[0180] Specifically, with Figure 4 and Figure 8 For example, Figure 4 This can be understood as ultrasonic generator A being in the collection sub-phase within the previously executed normal cycle phase. Figure 8 This can be understood as ultrasonic generator A being in a cyclical movement sub-phase within a previously executed normal cycle, and ultrasonic generator B being in a collection sub-phase within a subsequently executed normal cycle. It can be understood that ultrasonic generator B can only reach position ① after ultrasonic generator A is driven away from position ① by the movement mechanism. Therefore, during the collection sub-phase of ultrasonic generator A, ultrasonic generator B can be driven by the movement mechanism to move from position ② to position ① along a preset circumferential trajectory 33. For example, during the step-movement time, as ultrasonic generator B moves along the preset circumferential trajectory 33 from position ② to position ① using the movement mechanism, ultrasonic generator B can adopt a movement method of first uniform acceleration and then uniform deceleration. In the time dimension, the two processes occur simultaneously, effectively saving time and ensuring the smoking effect.

[0181] S560. Turn on the ultrasonic generator located at the first position point, so that the ultrasonic waves emitted by the ultrasonic generator and reflected by the reflection mechanism form a standing wave that gathers the oil fume particles in the incoming airflow and suspends them.

[0182] S570: Monitor the amount of oil fumes suspended in the standing wave corresponding to the first position point in real time until the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches the preset value.

[0183] S580 When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator is driven to move along the preset circumferential trajectory with a third acceleration a3 within the third time Ta3 using the moving mechanism.

[0184] Specifically, with Figure 4 and Figure 8 For example, Figure 4 The moving plane 32 includes two ultrasonic generators 31, namely ultrasonic generator A and ultrasonic generator B. At the current normal cycle time, ultrasonic generator A is located at position point ① and ultrasonic generator B is located at position point ②. Figure 4 The first position point can be position point ①, and the second position point can be position point ②. When ultrasonic generator A at position point ① is turned on, and the amount of oil fume suspended in the standing wave corresponding to position point ① reaches a preset value, a moving mechanism can be used to drive ultrasonic generator A away from position point ①. Afterwards, the moving mechanism can also be used to drive ultrasonic generator B away from position point ② within a third time period Ta3, moving it along a preset circumferential trajectory 33 with a third acceleration a3. For example, Ta3 can be 1-2 seconds.

[0185] S590. Using the moving mechanism, within the fourth time Ta4, drive the ultrasonic generator to move along a preset circumferential trajectory with a fourth acceleration a4 until it returns to the first position point.

[0186] Specifically, please refer to Figure 4 and Figure 8 After the uniformly accelerated movement, the ultrasonic generator B is driven to continue moving along the preset circumferential trajectory 33 with a fourth acceleration a4 within the fourth time period Ta4, until the movement returns to position point ①. For example, Ta4 can be 2-3 seconds.

[0187] This invention also provides a control method for a range hood based on ultrasonic standing waves, such as... Figure 15 As shown, with Figure 4 and Figure 8For example, firstly, in the preparation stage, a moving mechanism can be used to drive each ultrasonic generator 31 to move, so that one ultrasonic generator 31 is stationary at both position point ① and position point ②, that is, ultrasonic generator A is located at position point ① and ultrasonic generator B is located at position point ②. Then, the operating level of the range hood is identified. For example, the operating level can include low, high, and high-power settings, and the operating power of the high setting is greater than that of the low setting, and the operating power of the high-power setting is greater than that of the high setting. Based on the different operating levels, the stepping time T required for the ultrasonic generator 31 to move one revolution along the preset circumferential trajectory 33 can be determined; where, 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). Subsequently, in the initial cycle phase, the ultrasonic generator B located at position ② is driven by a moving mechanism to move towards position ① along a preset circumferential trajectory 33 using a movement pattern of first uniform acceleration and then uniform deceleration (the third acceleration during uniform acceleration is a3, the third time is Ta3, and the fourth acceleration during uniform deceleration is a4, the fourth time is Ta4). Then, in the normal cycle phase, the ultrasonic generator A located at position ① is activated. The ultrasonic generator A emits ultrasonic waves, which are reflected by a reflective structure to form a standing wave. This standing wave can gather and suspend oil fume particles in the incoming airflow. The amount of oil fume suspended in the standing wave corresponding to position ① is monitored in real time. If the amount of oil fume does not reach the preset value, the amount of oil fume suspended in the standing wave corresponding to position ① continues to be monitored in real time. When the amount of oil fume reaches a preset value, the ultrasonic generator A can be driven by a moving mechanism to move along a preset circumferential trajectory 33 from position ① in a manner of uniform acceleration followed by uniform deceleration (the first acceleration during uniform acceleration is a1, the first time is Ta1, the second acceleration during uniform deceleration is a2, and the second time is Ta2), until it returns to position ①. It can be understood that ultrasonic generator B can only reach position ① after ultrasonic generator A has left position ①. Furthermore, during its movement along the preset circumferential trajectory 33, ultrasonic generator A is turned off at position ② to release the oil 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, all ultrasonic generators 31 are turned off, and the moving mechanism drives each ultrasonic generator 31 to move to its corresponding preset initial position on the preset circumferential trajectory 33.

[0188] 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 two 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). Two position points are provided on the preset circumferential trajectory (33). The two 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, elliptical or polygonal, and the position points are evenly distributed on the preset circumferential trajectory (33).

3. The range hood according to claim 2, characterized in that, The preset circumferential trajectory (33) is square, and the first position point and the second position point are located at the two opposite vertices of the square.

4. The range hood according to claim 1, characterized in that, The first position point is the position point in the preset circumferential trajectory (33) that is farthest from the air inlet (11) in the direction of airflow, and / or the second position point is the position point in the preset circumferential trajectory (33) that is closest to the air inlet (11) in the direction of airflow.

5. 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 1-4; For any one of the ultrasonic generators (31), the control method includes multiple normal cycle phases, and the normal cycle phases of the two ultrasonic generators (31) are executed alternately with overlapping beginnings and ends; Any normal cycle phase of any of the ultrasonic generators (31) includes a collection sub-phase and a cyclic movement sub-phase; The collection sub-stage includes: Turn on the ultrasonic generator (31) located at the first position point, so that the ultrasonic generator (31) emits ultrasonic waves and the standing wave formed by the reflection mechanism (40) gathers the oil fume particles in the incoming airflow and suspends them. The amount of oil fumes suspended in the standing wave corresponding to the first location point is monitored in real time until the amount of oil fumes suspended in the standing wave corresponding to the first location point reaches a preset value. The cyclic movement sub-stage includes: When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator (31) is driven by the moving mechanism to move along the preset circumferential trajectory (33) from the first position point in a moving manner of first uniform acceleration and then uniform deceleration until it moves back to the first position point. When the ultrasonic generator (31) moves to the second position point, it is turned off to release the oil fume particles suspended in the corresponding standing wave; in the time dimension, in two adjacent and overlapping normal cycle stages, the collection sub-stage in the later-executed normal cycle stage is located within the cycle movement sub-stage in the earlier-executed normal cycle stage.

6. The control method according to claim 5, 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 one revolution along the preset circumferential trajectory (33) during the normal cycle phase; When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the ultrasonic generator (31) is driven by the moving mechanism to move along the preset circumferential trajectory (33) from the first position point in a moving manner of first uniform acceleration and then uniform deceleration, until it moves back to the first position point, including: When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive the ultrasonic generator (31) to leave the first position point in a moving manner with uniform acceleration followed by uniform deceleration within the stepping movement time, until the movement returns to the first position point.

7. The control method according to claim 6, 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, the step movement time required for the ultrasonic generator (31) to move one revolution along the preset circumferential trajectory (33) during the normal cycle phase is determined, including: When the operating gear is the first gear, the stepping time required for the ultrasonic generator (31) to move one revolution along the preset circumferential trajectory (33) 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 (31) to move one revolution along the preset circumferential trajectory (33) during the normal cycle phase is determined as the second movement time T2; wherein, T1 < T2.

8. The control method according to claim 6, characterized in that, Based on the operating gear, after determining the step movement time required for the ultrasonic generator (31) to move one revolution along the preset circumferential trajectory (33) during the normal cycle phase, the method further includes: Based on the determined step movement time and the distance from leaving the first position point to moving back to the first position point along the preset circumferential trajectory (33), a first acceleration a1 and a first time Ta1 during the acceleration process and a second acceleration a2 and a second time Ta2 during the deceleration process are set; wherein, a1 > 0, a2 < 0; When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism, within the stepping movement time, drives the ultrasonic generator (31) to move along the preset circumferential trajectory (33) from the first position point in a movement mode of first uniform acceleration and then uniform deceleration, until it moves back to the first position point, including: When the amount of oil fumes suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism is used to drive the ultrasonic generator (31) to move along the preset circumferential trajectory (33) with the first acceleration a1 within the first time Ta1. Using the moving mechanism, the ultrasonic generator (31) is driven to move along the preset circumferential trajectory (33) with a uniform deceleration of the second acceleration a2 within the second time Ta2 until it moves back to the first position point.

9. The control method according to claim 8, characterized in that, |a1|≤|a2|.

10. The control method according to claim 6, characterized in that, The control method further includes a preparation phase and a preliminary cycle phase. In terms of time, the preliminary cycle phase precedes the normal cycle phase, and the preparation phase precedes the preliminary cycle phase. The preparation phase includes: The ultrasonic generator (31) is moved by the moving mechanism so that an ultrasonic generator (31) is stationed at both the first position point and the second position point; The initial cycle phase includes: The ultrasonic generator (31) located at the second position point is driven by the moving mechanism to move from the second position point to the first position point along the preset circumferential trajectory (33) in a moving manner of first accelerating and then decelerating uniformly. The preliminary cycle phase overlaps with the first normal cycle phase, and the collection sub-phase in the first normal cycle phase is located within the preliminary cycle phase.

11. The control method according to claim 10, characterized in that, The ultrasonic generator (31) located at the second position point is driven by the moving mechanism to move from the second position point to the first position point along the preset circumferential trajectory (33) in a movement mode of first uniform acceleration and then uniform deceleration, including: Using the moving mechanism, during the stepping movement time, the ultrasonic generator (31) located at the second position point is driven to move from the second position point to the first position point along the preset circumferential trajectory (33) in a movement mode of first uniform acceleration and then uniform deceleration.

12. The control method according to claim 11, characterized in that, Based on the operating gear, after determining the step movement time required for the ultrasonic generator (31) to move one revolution along the preset circumferential trajectory (33) during the normal cycle phase, the method further includes: Based on the determined step movement time and the distance traveled from the second position point to the first position point along the preset circumferential trajectory (33), a third acceleration a3 and a third time Ta3 during the acceleration process and a fourth acceleration a4 and a fourth time Ta4 during the deceleration process are set; wherein, a3 > 0, a4 < 0; When the amount of oil fume suspended in the standing wave corresponding to the first position point reaches a preset value, the moving mechanism, within the stepping movement time, drives the ultrasonic generator (31) to move along the preset circumferential trajectory (33) from the first position point in a movement mode of first uniform acceleration and then uniform deceleration, until it moves back to the first position point, 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 drives the ultrasonic generator (31) to move along the preset circumferential trajectory (33) with the third acceleration a3 within the third time Ta3. Using the moving mechanism, the ultrasonic generator (31) is driven to move along the preset circumferential trajectory (33) with a uniform deceleration of the fourth acceleration a4 within the fourth time Ta4 until it returns to the first position point.

13. The control method according to claim 5, 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, and the moving mechanism is used to drive each of the ultrasonic generators (31) to move to the corresponding preset initial position point on the preset circumferential trajectory (33).

Images