A range hood and a control method, control device and storage medium thereof

Abstract

The application discloses an extractor hood and a control method, a control device and a storage medium thereof. The extractor hood comprises a centrifugal fan, the centrifugal fan comprises a volute, an impeller and a volute tongue driving mechanism; the volute comprises an air inlet, an air outlet, a volute surrounding plate, a volute tongue assembly and an air outlet baffle. The control method of the extractor hood comprises: acquiring the running parameters of the centrifugal fan in real time; determining the current running gear of the centrifugal fan according to the current running parameters of the centrifugal fan; determining the target parameter range corresponding to the current running gear according to the current running gear; and controlling the volute tongue driving mechanism to drive the volute tongue assembly to move according to the current running parameters and the target parameter range, so as to adjust the gap size between the volute tongue assembly and the impeller. Through the above technical scheme, the relative position between the volute tongue assembly and the impeller can be adjusted according to different working conditions, so that the centrifugal fan can produce smaller noise under different wind pressures, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a range hood and its control method, control device and storage medium. Background Technology

[0002] With the continuous improvement of people's living standards, the impact of kitchen fumes on users' health and environmental safety has become a major concern. Therefore, range hoods have become an indispensable kitchen appliance in modern homes. Multi-blade centrifugal fans have advantages such as compact structure, high pressure coefficient, large flow coefficient, and low noise, and are therefore widely used in range hood products.

[0003] Traditional centrifugal fans have a volute tongue near the outlet of the volute casing, which prevents some gas from circulating within the casing. The airflow at the impeller outlet has a strong impact on the volute tongue, resulting in complex gas flow near the tongue and significantly affecting fan performance. While reducing the gap between the volute tongue and the impeller improves fan efficiency and pressure, it also increases noise. Furthermore, the shape of the volute tongue is often only effective under one operating condition, easily leading to a significant performance drop in other conditions. Summary of the Invention

[0004] This invention provides a range hood and its control method, control device and storage medium to overcome the defects of the prior art. The relative position between the volute assembly and the impeller is adjusted according to different working conditions so that the centrifugal fan can generate less noise when the wind pressure is different, thereby improving the user experience.

[0005] In a first aspect, the present invention provides a range hood, comprising: a centrifugal fan; the centrifugal fan includes a volute, an impeller, and a volute tongue drive mechanism;

[0006] The volute includes an air inlet, an air outlet, a volute casing plate, a volute tongue assembly, and an air outlet baffle. The volute tongue assembly is disposed between the air outlet baffle and the volute casing plate, and the air outlet baffle is located on the side of the volute tongue assembly closer to the air outlet. The impeller is located inside the volute and is disposed at the air inlet. The volute tongue drive mechanism is used to drive the volute tongue assembly to move, so as to adjust the gap between the volute tongue assembly and the impeller.

[0007] Optionally, the worm gear drive mechanism includes a cam, a driven wheel, and a drive element;

[0008] The cam abuts against the surface of the volute assembly on the side opposite to the impeller;

[0009] The driven wheel is fixedly connected to the cam; the output shaft of the drive component is connected to the driven wheel; the drive component is used to drive the driven wheel to rotate, so that the driven wheel drives the cam to rotate along the axis of the driven wheel.

[0010] Optionally, the surface on which the cam abuts against the worm tongue assembly is the contact surface of the cam;

[0011] Along the direction away from the driven wheel, the curvature of the contact surface gradually increases.

[0012] Optionally, the worm tongue assembly includes a flexible worm tongue;

[0013] One end of the flexible volute tongue is movably connected to the air outlet baffle, and the other end of the flexible volute tongue is movably connected to the volute shell enclosure plate.

[0014] The cam abuts against the side of the flexible volute tongue that is away from the impeller; the cam rotates to control the flexible volute tongue to move closer to or further away from the outlet baffle along the circumferential direction of the volute casing.

[0015] Optionally, the volute tongue assembly includes a rigid volute tongue and a volute tongue baffle;

[0016] The rigid volute tongue protrudes towards the side closest to the impeller; the volute tongue baffle is fixed to the side of the rigid volute tongue away from the impeller; one end of the rigid volute tongue is movably connected to the air outlet baffle, and the other end of the rigid volute tongue is movably connected to the volute casing plate.

[0017] The cam abuts against the side surface of the volute tongue baffle that is away from the rigid volute tongue; the cam rotates to drive the volute tongue baffle to move the rigid volute tongue along the circumferential direction of the volute casing, closer to or further away from the side of the air outlet baffle.

[0018] Optionally, the volute tongue assembly is movably connected to the air outlet baffle and the volute casing plate, respectively;

[0019] The air outlet baffle includes a double-layer baffle portion with gaps; the volute enclosure includes a double-layer enclosure portion with gaps.

[0020] The first end of the volute tongue assembly is located in the gap between the double-layer baffle section; the second end of the volute tongue assembly is located in the gap between the double-layer enclosure section.

[0021] In a second aspect, the present invention provides a control method for a range hood, used to control the aforementioned range hood, comprising:

[0022] Real-time acquisition of centrifugal fan operating parameters; operating parameters include noise and air pressure at the outlet;

[0023] Determine the current operating speed of the centrifugal fan based on its current operating parameters;

[0024] Determine the target parameter range corresponding to the current operating gear based on the current operating gear.

[0025] Based on the current operating parameters and the target parameter range, the worm tongue drive mechanism is controlled to drive the worm tongue assembly to move, so as to adjust the clearance size between the worm tongue assembly and the impeller.

[0026] Optionally, the centrifugal fan's operating speed includes multiple speed ranges, each speed range including at least one operating speed; the speed ranges include a first speed range, a second speed range, and a third speed range; when the centrifugal fan operates at the first speed range, the wind force generated by the impeller is in the first wind force range; when the centrifugal fan operates at the second speed range, the wind force generated by the impeller is in the second wind force range; when the centrifugal fan operates at the third speed range, the wind force generated by the impeller is in the third wind force range.

[0027] Among them, the wind force in the first wind force zone is less than the wind force in the second wind force zone, and the wind force in the second wind force zone is less than the wind force in the third wind force zone.

[0028] Optionally, the current operating level of the centrifugal fan can be determined based on its current operating parameters, including:

[0029] Determine whether the current operating parameters of the centrifugal fan meet the gear range conditions; the gear range conditions include whether the current noise in the current operating parameters is within the first noise range, or whether the current air pressure in the current operating parameters is within the third air pressure range.

[0030] If not, then the current operating speed of the centrifugal fan is determined to be within the second speed range.

[0031] Optionally, determining the current operating level of the centrifugal fan based on its current operating parameters also includes:

[0032] If the current noise level in the current operating parameters is within the first noise range, then the current operating speed of the centrifugal fan is determined to be within the first speed range.

[0033] If the current wind pressure in the current operating parameters is within the third wind pressure range, then the current operating speed of the centrifugal fan is determined to be within the third speed range.

[0034] Optionally, based on the current operating gear, determine the target parameter range corresponding to the current operating gear, including:

[0035] When the current operating speed of the centrifugal fan is within the first speed range, the target parameter range corresponding to the current operating speed includes the first air pressure range;

[0036] When the current operating speed of the centrifugal fan is within the second speed range, the target parameter range corresponding to the current operating speed includes the second air pressure range and the second noise range.

[0037] When the current operating speed of the centrifugal fan is within the third speed range, the target parameter range corresponding to the current operating speed includes the third noise range;

[0038] Among them, the noise in the first noise range is less than the noise in the second noise range, and the noise in the second noise range is less than the noise in the third noise range; the wind pressure in the first wind pressure range is less than the wind pressure in the second wind pressure range, and the wind pressure in the second wind pressure range is less than the wind pressure in the third wind pressure range.

[0039] Optionally, based on the current operating parameters and the target parameter range, the worm tongue drive mechanism is controlled to drive the worm tongue assembly to move, thereby adjusting the clearance dimension between the worm tongue assembly and the impeller, including:

[0040] Determine whether the current noise and / or current wind pressure in the current operating parameters are within the target parameter range;

[0041] If not, the worm tongue drive mechanism is controlled to drive the worm tongue assembly to move, thereby increasing the clearance between the worm tongue assembly and the impeller.

[0042] Optionally, the control methods for the range hood also include:

[0043] During the process of controlling the volute drive mechanism to drive the volute assembly to move, the process returns to the steps of real-time acquisition of the centrifugal fan's operating parameters and determination of whether the current operating parameters meet the target parameter conditions, until the current operating parameters meet the target parameter conditions.

[0044] Thirdly, the present invention also provides a control device for a range hood, used to control the range hood, comprising:

[0045] The parameter acquisition module is used to acquire the operating parameters of the centrifugal fan in real time; the operating parameters include noise and air pressure at the air outlet.

[0046] The gear determination module is used to determine the current operating gear of the centrifugal fan based on the current operating parameters of the centrifugal fan.

[0047] The parameter range determination module is used to determine the target parameter range corresponding to the current operating gear based on the current operating gear.

[0048] The drive control module is used to control the worm tongue drive mechanism to drive the worm tongue assembly to move according to the current operating parameters and the target parameter range, so as to adjust the clearance size between the worm tongue assembly and the impeller.

[0049] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions that are used to cause a processor to execute the above-described control method for a range hood.

[0050] The technical solution of this invention acquires the operating parameters of a centrifugal fan in real time, including noise and air pressure at the outlet. Based on these parameters, the current operating speed of the centrifugal fan is determined. Then, based on this speed, a target parameter range is determined. Finally, based on the current and target parameter ranges, the volute drive mechanism is controlled to move the volute assembly, thereby adjusting the clearance between the volute assembly and the impeller. This method allows the centrifugal fan to adjust the clearance between the volute assembly and the impeller according to different operating conditions, achieving sufficient air pressure while maintaining low noise levels, thus improving the user experience. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the structure of a range hood provided in Embodiment 1 of the present invention;

[0053] Figure 2 This is a schematic diagram of the structure of a volute tongue assembly provided in Embodiment 1 of the present invention;

[0054] Figure 3 This is a schematic diagram of the structure of the driving component provided in Embodiment 1 of the present invention;

[0055] Figure 4 This is a schematic diagram of another spiral tongue assembly provided in Embodiment 1 of the present invention;

[0056] Figure 5 This is a flowchart of a control method for a range hood provided in Embodiment 2 of the present invention;

[0057] Figure 6 This is a flowchart of a control method for a range hood provided in Embodiment 3 of the present invention;

[0058] Figure 7 This is a flowchart of a control method for a range hood provided in Embodiment 4 of the present invention;

[0059] Figure 8 This is a schematic diagram of the control device for a range hood provided in Embodiment 5 of the present invention.

[0060] In the diagram: 1. Centrifugal fan; 11. Volute; 12. Impeller; 13. Volute tongue drive mechanism; 111. Air inlet; 112. Air outlet; 113. Volute casing enclosure; 114. Volute tongue assembly; 115. Air outlet baffle; 131. Cam; 132. Driven wheel; 133. Drive component; 1141. Flexible volute tongue; 1142. Rigid volute tongue; 1143. Volute tongue baffle; 1151. Double-layer baffle section; 1131. Double-layer enclosure section. Detailed Implementation

[0061] 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.

[0062] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0063] The term "comprising" and its variations as used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0064] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0065] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0066] Example 1

[0067] This invention provides a range hood, see reference. Figure 1As shown, the range hood includes a centrifugal fan 1. The centrifugal fan 1 includes a volute 11, an impeller 12, and a volute tongue drive mechanism 13. The volute 11 includes an air inlet 111, an air outlet 112, a volute casing plate 113, a volute tongue assembly 114, and an air outlet baffle 115. The volute tongue assembly 114 is disposed between the air outlet baffle 115 and the volute casing plate 113, with the air outlet baffle 115 located on the side of the volute tongue assembly 114 closest to the air outlet 112. The impeller 12 is located inside the volute 11 and is positioned at the air inlet 111. The volute tongue drive mechanism 13 drives the volute tongue assembly 114 to adjust the gap between the volute tongue assembly 114 and the impeller 12.

[0068] Specifically, the volute 11 includes an air inlet 111, an air outlet 112, a volute enclosure 113, a volute tongue assembly 114, and an air outlet baffle 115. The air inlet 111 and the air outlet 112 are connected by a flow space formed by the volute enclosure 113, the volute tongue assembly 114, and the air outlet baffle 115. An impeller 12 is installed inside the volute 11. When the impeller 12 rotates, it can generate negative pressure through the opening of the air inlet 111 to adsorb the oil fumes. Through the flow space inside the volute 11, the oil fumes are finally discharged from the air outlet 112 into the public flue, thereby improving the oil fume situation in the kitchen.

[0069] In addition, the centrifugal fan 1 also includes a volute tongue assembly 114, which is disposed inside the volute housing 11 and located between the outlet baffle 115 and the volute housing surround 113. When airflow passes near the volute tongue assembly 114, the volute tongue assembly 114 splits the airflow in two. Most of the airflow flows to the outlet 112 of the centrifugal fan and is discharged into the common flue, while a small portion of the airflow flows back into the volute housing 11 through the gap between the volute tongue assembly 114 and the impeller 12. After rotating once inside the volute housing 11 with the impeller 12, it returns to the volute tongue assembly 114 to participate in a new split. The function of the volute tongue assembly 114 is to prevent gas from circulating inside the volute housing 11, thereby improving efficiency. At the same time, the volute tongue assembly 114 is also an important component affecting noise. Therefore, the volute tongue assembly 114 has a significant impact on the efficiency and noise of the centrifugal fan. The deeper the structure of the volute tongue assembly 114, the smaller the gap between it and the impeller 12, and the smaller the leakage between the spiral part of the volute 11 and the outlet 112, which is beneficial to improving the efficiency and pressure of the fan.

[0070] In addition, the centrifugal fan 1 also includes a volute drive mechanism 13, which drives the volute assembly 114 to move, thereby adjusting the gap between the volute assembly 114 and the impeller 12. This increases or decreases the gap between the volute assembly 114 and the impeller 12, controlling the air pressure at the outlet to meet the needs of the centrifugal fan 1 under different operating conditions. Thus, by installing a centrifugal fan on the range hood, the volute drive mechanism within the centrifugal fan can drive the volute assembly to move, increasing or decreasing the gap between the volute assembly and the impeller. This allows the centrifugal fan to adjust the relative position between the volute assembly and the impeller according to different operating conditions, enabling the centrifugal fan to generate less noise while meeting air pressure requirements, thus improving the user experience.

[0071] Optional, see reference Figure 2 and Figure 3 As shown, the volute drive mechanism 13 includes a cam 131, a driven wheel 132, and a drive member 133; the cam 131 abuts against the surface of the volute assembly 114 opposite to the impeller 12; the driven wheel 132 is fixedly connected to the cam 131; the output shaft of the drive member 133 is connected to the driven wheel 132; the drive member 133 is used to drive the driven wheel 132 to rotate, so that the driven wheel 132 drives the cam 131 to rotate along the axis of the driven wheel 132.

[0072] Specifically, the driving component 133 drives the driven wheel 132 to rotate. After the driven wheel 132 starts to rotate, it will drive the cam 131, which is fixedly connected to the driven wheel 132, to rotate along the axis of rotation of the driven wheel 132, thereby achieving the purpose of adjusting the length of the volute tongue assembly 114 extending into the volute 11 and the gap between the volute tongue assembly 114 and the impeller 12.

[0073] Optional, continue to refer to Figure 2 The surface on which the cam 131 abuts against the worm gear assembly 114 is the contact surface of the cam 131; the curvature of the contact surface gradually increases in the direction away from the driven wheel 132.

[0074] Specifically, the contact surface of the volute assembly 114 abuts against the cam 131 on the side facing the air outlet 112. The driving member 133 drives the driven wheel 132 to rotate. As the driven wheel 132 rotates, it drives the cam 131 to rotate along the axis of the driven wheel 132. During the rotation of the cam 131, since the cam 131 is irregularly shaped, that is, along the direction away from the driven wheel 132, the curvature of the contact surface facing the air outlet 112 gradually changes. When the curvature of the contact surface gradually increases, the gap between the volute assembly 114 and the impeller 12 decreases accordingly. Conversely, when the curvature of the contact surface gradually decreases, the gap between the volute assembly 114 and the impeller 12 increases accordingly. This structure can greatly reduce the probability of flow separation and backflow at the volute assembly 114 of the centrifugal fan 1, reduce impact loss, and help improve the air volume, air pressure, efficiency and reduce aerodynamic noise of the centrifugal fan 1.

[0075] Optional, see reference Figure 4 As shown, the volute tongue assembly 114 includes a flexible volute tongue 1141; one end of the flexible volute tongue 1141 is movably connected to the air outlet baffle 115, and the other end of the flexible volute tongue 1141 is movably connected to the volute casing shroud 113; the cam 131 abuts against the side surface of the flexible volute tongue 1141 away from the impeller 12; the cam 131 rotates to control the flexible volute tongue 1141 to move closer to or further away from the air outlet baffle 115 along the circumferential direction of the volute casing shroud 113.

[0076] Specifically, the volute tongue assembly 114 includes a flexible volute tongue 1141. When the driven wheel 132 is driven to rotate by the drive member 133 and the cam 131 rotates along the axis of the driven wheel 132, the cam 131 abuts against the side of the flexible volute tongue 1141 away from the impeller 12. Therefore, when the cam 131 rotates, it controls the flexible volute tongue 1141 to move closer to or further away from the side of the air outlet baffle 115 along the circumferential direction of the volute casing 113. During the movement of the flexible volute tongue 1141, the radius of curvature of the flexible volute tongue 1141 will increase or decrease accordingly, thereby increasing or decreasing the gap between the volute tongue assembly 114 and the impeller 12. Adjusting the size of the gap between the volute tongue assembly 114 and the impeller 12 controls the air pressure at the air outlet 112, meeting the needs of different operating conditions of the centrifugal fan.

[0077] Optional, continue to refer to Figure 2As shown, the volute tongue assembly 114 includes a rigid volute tongue 1142 and a volute tongue baffle 1143; the rigid volute tongue 1142 protrudes towards the side closer to the impeller 12; the volute tongue baffle 1143 is fixed to the side of the rigid volute tongue 1142 away from the impeller 12; one end of the rigid volute tongue 1142 is movably connected to the outlet baffle 115, and the other end of the rigid volute tongue 1142 is movably connected to the volute casing plate 113; the cam 131 abuts against the surface of the volute tongue baffle 1143 away from the rigid volute tongue 1142; the cam 131 rotates to drive the volute tongue baffle 1143 to move the rigid volute tongue 1142 along the circumferential direction of the volute casing plate 113, closer to or away from the side of the outlet baffle 115.

[0078] Specifically, the volute tongue assembly 114 includes a rigid volute tongue 1142 and a volute tongue baffle 1143. When the driven wheel 132 is driven to rotate by the driving member 133, causing the cam 131 to rotate along the axis of the driven wheel 132, the cam 131 abuts against the side of the volute tongue baffle 1143 away from the rigid volute tongue 1142. Therefore, when the cam 131 rotates, it drives the volute tongue baffle 1143 to move the rigid volute tongue 1142 along the circumferential direction of the volute casing 113, closer to or further away from the side of the outlet baffle 115. This causes the gap between the volute tongue assembly 114 and the impeller 12 to increase or decrease. When the gap between the volute tongue assembly 114 and the impeller 12 changes, the radius of curvature of the rigid volute tongue 1142 remains unchanged. In this way, not only can the needs of different operating conditions of the centrifugal fan be met, but the operational stability of the centrifugal fan can also be ensured.

[0079] Optional, see reference Figure 4 As shown, the volute tongue assembly 114 is movably connected to the air outlet baffle 115 and the volute casing plate 113 respectively; the air outlet baffle 115 includes a double-layer baffle portion 1151 with a gap; the volute casing plate 113 includes a double-layer casing portion 1131 with a gap; the first end of the volute tongue assembly 114 is located at the gap of the double-layer baffle portion 1151; the second end of the volute tongue assembly 114 is located at the gap of the double-layer casing portion 1131.

[0080] Specifically, the volute tongue assembly 114 is movably connected to the outlet baffle 115 and the volute casing shroud 113, respectively. Thus, when the cam 131 rotates, the volute tongue assembly 114 can move. Through the connection between the volute tongue assembly 114 and the double-layer baffle portion 1151 and the double-layer casing portion 1131 with gaps, the volute tongue assembly 114 can move up and down at the connection point, ensuring that the gap between the volute tongue assembly 114 and the impeller 12 can meet the needs of different operating conditions of the centrifugal fan.

[0081] It is understood that the range hood provided in the embodiments of the present invention may further include a range hood controller, which can control the volute drive mechanism to drive the volute assembly to move. The range hood controller can execute the control method of the range hood in any embodiment of the present invention. Therefore, the range hood provided in the embodiments of the present invention has the technical features of the control method of the range hood provided in any embodiment of the present invention, and can achieve the beneficial effects of the control method of the range hood provided in any embodiment of the present invention. The specific details will be described in detail in the following embodiments, and will not be repeated here.

[0082] Example 2

[0083] This invention provides a control method for a range hood. This control method can adapt to different operating conditions of the range hood and balance the noise from the centrifugal fan. The control method provided in this invention can be executed using a control device provided in this invention. This control device can be implemented by hardware and / or software and can be integrated into the range hood controller of this invention. (See reference...) Figure 5 As shown, the control method of this range hood includes:

[0084] S110: Real-time acquisition of centrifugal fan operating parameters.

[0085] The operating parameters include noise and air pressure at the air outlet. The noise of the centrifugal fan can be detected by setting up a corresponding noise sensor, which can detect the noise of the centrifugal fan in real time and provide real-time feedback on the detected noise. The air pressure at the air outlet of the centrifugal fan can be detected by an air pressure sensor, which can be set at the air outlet so that the air pressure sensor can detect the air pressure at the air outlet in real time and provide real-time feedback on the detected air pressure.

[0086] Specifically, when a user is cooking, the range hood operates normally, and the impeller in the centrifugal fan starts rotating. This allows the cooking fumes generated during cooking to be drawn to the inlet of the centrifugal fan and transported through the fan's casing to the outlet, where they are then discharged into the common flue. During operation, the centrifugal fan generates some noise. Typically, when higher smoke extraction efficiency is required, the impeller speed is relatively high, increasing the amount of cooking fumes absorbed and resulting in higher air pressure at the outlet. This, in turn, increases the noise level of the centrifugal fan, negatively impacting the user's cooking experience. This embodiment uses corresponding sensors to acquire real-time data on the centrifugal fan's noise and the air pressure at the outlet, allowing for adjustments to these parameters.

[0087] S120. Determine the current operating speed of the centrifugal fan based on its current operating parameters.

[0088] Specifically, a centrifugal fan can include multiple operating speeds. At different operating speeds, the impeller rotates at different speeds, resulting in different operating parameters, namely, varying air pressure and noise at the fan outlet. Thus, by having a noise sensor provide real-time feedback on the fan's noise level and an air pressure sensor provide real-time feedback on the air pressure at the outlet, the noise levels at each moment can be determined. These current operating parameters constitute the current operating parameters of the centrifugal fan. Based on these parameters, the current operating speed of the centrifugal fan can be determined, facilitating the determination of the required noise and / or air pressure range for the centrifugal fan.

[0089] In an optional embodiment, the centrifugal fan's operating speed may include multiple speed ranges, each speed range including at least one operating speed; the speed ranges include a first speed range, a second speed range, and a third speed range; when the centrifugal fan operates at the first speed range, the wind force generated by the impeller is in the first wind force range; when the centrifugal fan operates at the second speed range, the wind force generated by the impeller is in the second wind force range; when the centrifugal fan operates at the third speed range, the wind force generated by the impeller is in the third wind force range. The wind force in the first wind force range is less than the wind force in the second wind force range, and the wind force in the second wind force range is less than the wind force in the third wind force range.

[0090] It is understandable that the higher the rotation speed of the impeller in a centrifugal fan, the greater the airflow it generates, and the higher the negative pressure at the air inlet. This results in a stronger ability to absorb cooking fumes at the air inlet. Therefore, the ability of a centrifugal fan to absorb cooking fumes when operating at its first speed setting is less than its ability to absorb cooking fumes when operating at its second speed setting, and the ability of a centrifugal fan to absorb cooking fumes when operating at its second speed setting is less than its ability to absorb cooking fumes when operating at its third speed setting. Thus, the operating speed of the range hood, i.e., the operating speed of the centrifugal fan, can be set based on the amount of cooking fumes generated during the user's cooking process.

[0091] For example, taking the first gear range of a centrifugal fan as including a low setting, the second gear range as including a high setting, and the third gear range as including a stir-fry setting, when the amount of oil fumes produced during cooking is small, the range hood can be activated at a low setting, allowing the centrifugal fan to operate at a low speed. Although the adsorption of oil fumes is less at this setting, the amount of oil fumes produced is still sufficient to meet the emission requirements. Furthermore, because the adsorption capacity for oil fumes is lower at this setting, the air pressure at the outlet is also lower, resulting in a lower noise level. Therefore, when the noise level in the current operating parameters is within a lower noise range and / or the air pressure is lower, the current operating setting of the centrifugal fan can be determined to be a low setting. When the amount of oil fumes produced during cooking is large, the range hood can be activated at a high setting, allowing the centrifugal fan to operate at a high speed. At this high speed, the impeller in the centrifugal fan can operate at a higher speed, resulting in a higher adsorption capacity for oil fumes. The high adsorption capacity meets the requirements for fume emission. Due to the high fume adsorption capacity at this operating setting, the air pressure at the outlet is also high, resulting in a relatively high noise level. Therefore, when the noise level and / or air pressure are both relatively high, the current operating setting of the centrifugal fan can be determined as the high-power setting. When the amount of fume generated during cooking is at its maximum, the range hood can be switched to the high-power setting. This allows the centrifugal fan to operate at its maximum speed, maximizing the adsorption of fume and fully meeting the emission requirements. However, because the fume adsorption capacity is at its maximum at this setting, the air pressure at the outlet is also at its maximum, resulting in the highest noise level, which can interfere with normal conversation. Therefore, when the noise level and / or air pressure are both at their maximum, the current operating setting of the centrifugal fan can be determined as the high-power setting.

[0092] It should be noted that the above description is only exemplified by the example that each gear interval includes one operating gear. In the embodiments of the present invention, each gear interval may include one, two or more operating gears. Under the premise of achieving the core inventive point of the embodiments of the present invention, the embodiments of the present invention do not specifically limit the number of operating gears included in each gear interval.

[0093] S130. Determine the target parameter range corresponding to the current operating gear based on the current operating gear.

[0094] The target parameter range may include, but is not limited to, the target noise range and / or the target wind pressure range. When the centrifugal fan operates at different speeds, it may correspond to different target parameter ranges. These different target parameter ranges may be different ranges of the same type of parameter or different types of parameters; however, this embodiment of the invention does not specifically limit this.

[0095] In an optional embodiment, there may be a corresponding mapping relationship between the operating gear and the target parameter range. This mapping relationship can be determined through experimentation or experience. After determining the current operating gear, the target parameter type and the numerical range of the target parameter type corresponding to the current operating gear can be determined from the mapping relationship between the operating gear and the target parameter range, and used as the target parameter range of the current operating gear.

[0096] S140. Based on the current operating parameters and the target parameter range, control the worm tongue drive mechanism to drive the worm tongue assembly to move, so as to adjust the clearance size between the worm tongue assembly and the impeller.

[0097] Specifically, after determining the current operating parameters and target parameter range of the centrifugal fan, based on the matching relationship between the current operating parameters and the target parameter range, it is determined whether the current operating parameters of the centrifugal fan are within the corresponding target parameter range. If the current operating parameters of the centrifugal fan are not within the target parameter range, for example, when the current operating parameters of the centrifugal fan are higher than the upper limit of the target parameter range, it indicates that the air pressure at the outlet is too high, the clearance between the volute assembly and the impeller is too small, and the noise generated is also too high. Therefore, it is necessary to control the volute drive mechanism to drive the volute assembly to move, so that the cam... Rotating clockwise increases the clearance between the volute assembly and the impeller, allowing the centrifugal fan's air pressure to circulate within the volute casing, thereby reducing the air pressure at the outlet and decreasing noise. If the current operating parameters of the centrifugal fan are lower than the lower limit of the target parameter range, it indicates that the air pressure at the outlet is too low and the clearance between the volute assembly and the impeller is too large. Therefore, it is necessary to control the volute drive mechanism to drive the volute assembly to rotate counterclockwise, reducing the clearance between the volute assembly and the impeller, thus reducing the amount of air pressure circulating within the volute casing and increasing the air pressure at the outlet.

[0098] This embodiment acquires the operating parameters of the centrifugal fan in real time, including noise and air pressure at the outlet. Based on the current operating parameters, the current operating speed of the centrifugal fan is determined. Based on the current operating speed, the target parameter range corresponding to the current operating speed is determined. Based on the current operating parameters and the target parameter range, the volute drive mechanism is controlled to drive the volute assembly to move, thereby adjusting the clearance between the volute assembly and the impeller. This allows the centrifugal fan to adjust the clearance between the volute assembly and the impeller according to different operating conditions, so that the centrifugal fan can generate less noise while meeting the air pressure requirements, thus improving the user experience.

[0099] Example 3

[0100] This embodiment refines the method for determining the current operating speed of the centrifugal fan based on the above embodiments. For details, please refer to... Figure 6 As shown, the control method of this range hood includes:

[0101] S210: Real-time acquisition of centrifugal fan operating parameters.

[0102] The operating parameters include noise and air pressure at the air outlet.

[0103] S220: Determine whether the current operating parameters of the centrifugal fan meet the gear range conditions; if yes, execute S230 or S240; if no, execute S250.

[0104] Among them, the gear range conditions include the current noise in the current operating parameters being within the first noise range, or the current wind pressure in the current operating parameters being within the third wind pressure range;

[0105] S230. If the current noise in the current operating parameters is within the first noise range, then the current operating speed of the centrifugal fan is determined to be within the first speed range.

[0106] S240. If the current air pressure in the current operating parameters is within the third air pressure range, then the current operating gear of the centrifugal fan is determined to be within the third gear range.

[0107] S250. Determine that the current operating speed of the centrifugal fan is within the second speed range.

[0108] Each gear range may include one or more operating gears. In an exemplary embodiment, taking each gear range as an example of one operating gear, when the gear range includes a first gear range, a second gear range, and a third gear range, the operating gear of the first gear range may be a low gear, the operating gear of the second gear range may be a high gear, and the operating gear of the third gear range may be a stir-fry gear.

[0109] Specifically, after acquiring the real-time noise and air pressure at the outlet of the centrifugal fan, the system determines whether the current noise and air pressure meet the requirements of the operating range. Specifically, it determines whether the current noise is within the first noise range or whether the current air pressure is within the third air pressure range. If the current noise is within the first noise range, the centrifugal fan is operated at the first operating range (low speed). Alternatively, if the current air pressure is within the third air pressure range, the centrifugal fan is operated at the third operating range (high speed). If neither the current noise nor the current air pressure is within the first or third air pressure range, the centrifugal fan is operated at the second operating range (high speed).

[0110] For example, the noise level f in the first noise range can be f0 < f ≤ f1, and the wind pressure p in the third wind pressure range can be p3 < p ≤ p4. When the current noise level f of the centrifugal fan is within the range of f0 < f ≤ f1, it can be directly determined that the centrifugal fan is in the low gear. When the current wind pressure p of the centrifugal fan is within the range of p3 < p ≤ p4, it can be directly determined that the centrifugal fan is in the high gear. That is, the range of the current noise level can determine whether the centrifugal fan is in the first gear range, and the range of the current wind pressure can determine whether the centrifugal fan is in the third gear range, so that the first gear range and the third gear range use different parameters as the judgment basis. When the current noise level f of the centrifugal fan is not within the range of f0 < f ≤ f1, and the current wind pressure p of the centrifugal fan is not within the range of p3 < p ≤ p4, it can be determined that the centrifugal fan is neither in the first gear range nor in the third gear range. At this time, it can be determined that the centrifugal fan is in the second gear range, that is, the centrifugal fan is in the high gear.

[0111] S260. Determine the target parameter range corresponding to the current operating gear based on the current operating gear.

[0112] In an optional embodiment, when the centrifugal fan's current operating speed is within a first speed range, the target parameter range corresponding to the current operating speed includes a first air pressure range; when the centrifugal fan's current operating speed is within a second speed range, the target parameter range corresponding to the current operating speed includes a second air pressure range and a second noise range; when the centrifugal fan's current operating speed is within a third speed range, the target parameter range corresponding to the current operating speed includes a third noise range. Specifically, the noise level within the first noise range is lower than the noise level within the second noise range, and the noise level within the second noise range is lower than the noise level within the third noise range; the air pressure within the first air pressure range is lower than the air pressure within the second air pressure range, and the air pressure within the second air pressure range is lower than the air pressure within the third air pressure range.

[0113] For example, when the first wind pressure range is p1 < p ≤ p2, the second wind pressure range is p2 < p ≤ p3, the second noise range is f1 < f ≤ f2, and the third noise range is f2 < f ≤ f3, and the wind pressure satisfies p1 < p2 < p3 and the noise satisfies f0 < f1 < f2 < f3, if the current operating speed of the centrifugal fan is within the first speed range, it can be considered that the current centrifugal fan is in a weak speed, and the target parameter range corresponding to the weak speed includes p1 < p ≤ p2; if the current operating speed of the centrifugal fan is within the third speed range, it can be considered that the centrifugal fan is in a high speed, and the target parameter range corresponding to the high speed includes f2 < f ≤ f3; if the current operating speed of the centrifugal fan is within the second speed range, it can be considered that the centrifugal fan is in a strong speed, and the target parameter range corresponding to the strong speed includes p2 < p ≤ p3 and f1 < f ≤ f2.

[0114] S270. Based on the current operating parameters and the target parameter range, control the worm tongue drive mechanism to drive the worm tongue assembly to move, so as to adjust the clearance size between the worm tongue assembly and the impeller.

[0115] This embodiment determines whether the current operating parameters of the centrifugal fan meet the gear range conditions. If the current operating parameters do not meet the gear range conditions, it can be determined that the current operating gear of the centrifugal fan is within the second gear range. If the current operating parameters meet the gear range conditions and the current noise level is within the first noise range, it can be determined that the current operating gear of the centrifugal fan is within the first gear range. If the current operating parameters meet the gear range conditions and the current air pressure is within the third air pressure range, it can be determined that the current operating gear of the centrifugal fan is within the third gear range. After determining the gear range of the current operating gear of the centrifugal fan, the target parameters and range corresponding to the current operating gear can be further determined based on the gear range of the current operating gear. According to the current operating parameters and the target parameter range, the volute drive mechanism is controlled to drive the volute assembly to move, thereby adjusting the clearance between the volute assembly and the impeller. This allows the centrifugal fan to adjust the clearance between the volute assembly and the impeller according to different operating conditions, so that the centrifugal fan can generate less noise while meeting the air pressure requirements, thus improving the user experience.

[0116] Example 4

[0117] This embodiment, based on the above embodiment, refines the method of controlling the worm tongue drive mechanism to drive the worm tongue assembly to move according to the current operating parameters and target parameter range, so as to adjust the clearance size between the worm tongue assembly and the impeller. (Refer to...) Figure 7 As shown, the control method of this range hood includes:

[0118] S310: Real-time acquisition of centrifugal fan operating parameters, including noise and air pressure at the outlet.

[0119] S320. Determine the current operating speed of the centrifugal fan based on its current operating parameters.

[0120] S330. Determine the target parameter range corresponding to the current operating gear based on the current operating gear.

[0121] S340. Determine whether the current noise and / or current wind pressure in the current operating parameters are within the target parameter range; if not, proceed to S350; if yes, proceed to S360.

[0122] S350: Control the worm tongue drive mechanism to drive the worm tongue assembly to move, thereby increasing the clearance size between the worm tongue assembly and the impeller.

[0123] S360, the cam does not rotate.

[0124] Specifically, the target parameter range determined based on the current operating speed can include the target noise range, the target air pressure range, or both. If the target parameter range only includes the target noise range, then the current noise level is used to determine whether it falls within the corresponding target noise range. If the current noise of the centrifugal fan is within the target noise range, it indicates that the gap between the volute assembly and the impeller meets the target noise range. In this case, the volute drive mechanism does not drive the volute assembly to move, and the cam will not rotate. Since the cam does not rotate, the gap between the volute assembly and the impeller will not change. If the current noise is not within the target noise range, it indicates that the gap between the volute assembly and the impeller cannot bring the current noise within the normal noise range, indicating that the current noise is too high. Therefore, the centrifugal fan needs to reduce the noise. The volute drive mechanism then drives the volute assembly to move, increasing the gap between the volute assembly and the impeller. By adjusting the gap size between the volute assembly and the impeller, the air pressure of the centrifugal fan can circulate within the volute casing, reducing the air pressure at the outlet and thus reducing noise.

[0125] Similarly, if the target parameter range only includes the target air pressure range, the current air pressure of the centrifugal fan is used to determine whether it falls within the target air pressure range. If the current air pressure is within the target air pressure range, it indicates that the gap between the volute assembly and the impeller meets the target air pressure range. In this case, the volute drive mechanism does not drive the volute assembly to move, so the cam will not rotate. Since the cam does not rotate, the gap between the volute assembly and the impeller will not change. If the current air pressure is not within the target parameter range, it indicates that the current air pressure is too high. Therefore, the centrifugal fan needs to reduce the air pressure. The volute drive mechanism drives the volute assembly to move, increasing the gap between the volute assembly and the impeller. By adjusting the gap size between the volute assembly and the impeller, the air pressure of the centrifugal fan can circulate within the volute casing, thereby reducing the air pressure at the outlet and reducing noise.

[0126] Similarly, if the target parameter range includes the target noise range and the target wind pressure range, then based on the current wind pressure and current noise of the centrifugal fan, it is determined whether the current wind pressure and current noise are within the target wind pressure range. If the current wind pressure and current noise of the centrifugal fan are within the target wind pressure range, it indicates that the clearance between the volute assembly and the impeller meets the wind pressure and noise range corresponding to the current operating gear. Therefore, the volute drive mechanism does not drive the volute assembly to move, and the cam will not rotate. Since the cam does not rotate, the volute... The gap between the component and the impeller will not change. If the current air pressure is not within the target air pressure range or the current noise is not within the target noise range, it indicates that the air pressure of the centrifugal fan is too high and the noise generated will also be large. If the gap between the volute assembly and the impeller cannot meet the target air pressure range or the target noise range, the volute drive mechanism will drive the volute assembly to move, thereby increasing the gap between the volute assembly and the impeller. By adjusting the gap size between the volute assembly and the impeller, the air pressure of the centrifugal fan can circulate in the volute casing, thereby reducing the air pressure at the air outlet and reducing noise.

[0127] For example, when the current noise f satisfies the range of f0 < f ≤ f1, it can be determined that the centrifugal fan is in a low setting. The target parameter range corresponding to the low setting is the first air pressure range, i.e., p1 < p ≤ p2. If the current air pressure of the centrifugal fan is within this first air pressure range, the cam will not rotate. However, when the current air pressure p > p2, it is necessary to control the volute drive mechanism to drive the volute assembly to move, thereby increasing the gap between the volute assembly and the impeller, reducing the air pressure at the outlet, and lowering the noise. When the current wind pressure p satisfies the range of p3 < p ≤ p4, it can be determined that the centrifugal fan is in the high-power mode. When the centrifugal fan is in the high-power mode, the target parameter range corresponding to the high-power mode includes the third noise range, i.e., f2 < f ≤ f3. If the current noise of the centrifugal fan is within this third noise range, the cam will not rotate. However, when the current noise f > f3, it is necessary to control the volute drive mechanism to drive the volute assembly to move, thereby increasing the gap between the volute assembly and the impeller, reducing the wind pressure at the air outlet, and lowering the noise. When the current wind pressure p does not satisfy the range of p3 < p ≤ p4, and the current noise f does not satisfy the range of f0 < f ≤ f1, it can be determined that the centrifugal fan is in high gear. When the centrifugal fan is in high gear, the target parameter range corresponding to high gear includes the second wind pressure range and the second noise range, that is, p2 < p ≤ p3 and f1 < f ≤ f2. If the current noise and current wind pressure of the centrifugal fan are within the range of the second wind pressure range and the second noise range, the cam will not rotate. However, when the current wind pressure p > p3 or the current noise f > f2, it is necessary to control the volute drive mechanism to drive the volute assembly to move, so that the gap between the volute assembly and the impeller increases, thereby reducing the wind pressure at the air outlet and reducing the noise.

[0128] S370. During the process of controlling the worm tongue drive mechanism to drive the worm tongue assembly to move, return to the execution of each step from real-time acquisition of the centrifugal fan's operating parameters to determining whether the current operating parameters meet the target parameter conditions, until the current operating parameters meet the target parameter conditions.

[0129] Specifically, after controlling the worm tongue drive mechanism to drive the worm tongue assembly to move, it is also necessary to return to real-time to obtain the current noise and current air pressure of the centrifugal fan, and determine whether the current air pressure and current noise meet the target parameter conditions. If the target parameter conditions are not met, the worm tongue drive mechanism is controlled to continue driving the worm tongue assembly to move, so that the gap between the worm tongue assembly and the impeller increases, the air pressure at the air outlet is reduced, and the noise is reduced, until the air pressure and noise at the air outlet both meet the target parameter conditions. Then, the worm tongue drive mechanism is no longer controlled to drive the worm tongue assembly to move, and the cam does not rotate.

[0130] This embodiment determines whether the current noise and / or current air pressure in the current operating parameters are within the target parameter range. When the current motion parameters are not within the target parameter range, the volute drive mechanism is controlled to drive the volute assembly to move, thereby increasing the clearance between the volute assembly and the impeller. This achieves the goal of meeting air pressure requirements while minimizing noise. Simultaneously, during the process of controlling the volute drive mechanism to drive the volute assembly, the system returns to the steps of real-time acquisition of the centrifugal fan's operating parameters up to determining whether the current operating parameters meet the target parameter conditions, until the current operating parameters meet the target parameter conditions. This forms a closed-loop control, meeting the needs of the centrifugal fan under different operating conditions, achieving lower noise while maintaining higher air pressure, thus ensuring the exhaust of cooking fumes and improving the user experience.

[0131] Example 5

[0132] This embodiment provides a control device for a range hood. This control device can adapt to different operating conditions of the centrifugal fan in the range hood, meeting the noise and air pressure requirements under different operating conditions. The control device can be implemented by software and / or hardware and integrated into the range hood controller provided in this embodiment. (Reference) Figure 8 As shown, the control device of the range hood includes:

[0133] The parameter acquisition module 110 is used to acquire the operating parameters of the centrifugal fan in real time; the operating parameters include noise and air pressure at the air outlet.

[0134] The gear determination module 120 is used to determine the current operating gear of the centrifugal fan based on the current operating parameters of the centrifugal fan.

[0135] The parameter range determination module 130 is used to determine the target parameter range corresponding to the current operating gear based on the current operating gear.

[0136] The drive control module 140 is used to control the worm tongue drive mechanism to drive the worm tongue assembly to move according to the current operating parameters and the target parameter range, so as to adjust the clearance size between the worm tongue assembly and the impeller.

[0137] The control device for the range hood provided in the embodiments of the present invention can execute the control method for the range hood provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. The similarities can be referred to the above description.

[0138] Example 6

[0139] This invention provides a computer-readable storage medium storing computer instructions that are used to cause a processor to execute the above-described control method for a range hood.

[0140] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0141] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0142] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0143] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0144] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0145] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0146] 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, characterized in that, include: Centrifugal fan (1); the centrifugal fan (1) includes a volute (11), an impeller (12) and a volute tongue drive mechanism (13); The volute (11) includes an air inlet (111), an air outlet (112), a volute casing plate (113), a volute tongue assembly (114), and an air outlet baffle (115); the volute tongue assembly (114) is disposed between the air outlet baffle (115) and the volute casing plate (113), and the air outlet baffle (115) is located on the side of the volute tongue assembly (114) closer to the air outlet (112); The impeller (12) is located inside the volute (11) and is disposed at the air inlet (111); The volute tongue drive mechanism (13) is used to drive the volute tongue assembly (114) to move, so as to adjust the gap size between the volute tongue assembly (114) and the impeller (12); The volute tongue assembly (114) is movably connected to the air outlet baffle (115) and the volute casing plate (113), respectively; The air outlet baffle (115) includes a double-layer baffle portion (1151) with gaps; the volute enclosure (113) includes a double-layer enclosure portion (1131) with gaps. The first end of the volute tongue assembly (114) is located at the gap of the double-layer baffle portion (1151); the second end of the volute tongue assembly (114) is located at the gap of the double-layer baffle portion (1131).

2. The range hood according to claim 1, characterized in that, The worm gear drive mechanism (13) includes a cam (131), a driven wheel (132), and a drive member (133). The cam (131) abuts against the side surface of the volute assembly (114) opposite to the impeller (12); The driven wheel (132) is fixedly connected to the cam (131); the output shaft of the driving member (133) is connected to the driven wheel (132); the driving member (133) is used to drive the driven wheel (132) to rotate, so that the driven wheel (132) drives the cam (131) to rotate along the axis of the driven wheel (132).

3. The range hood according to claim 2, characterized in that, The surface on which the cam (131) abuts against the volute tongue assembly (114) is the contact surface of the cam (131); The curvature of the contact surface gradually increases in the direction away from the driven wheel (132).

4. The range hood according to claim 2, wherein the volute assembly (114) includes a flexible volute tongue (1141). One end of the flexible volute tongue (1141) is movably connected to the air outlet baffle (115), and the other end of the flexible volute tongue (1141) is movably connected to the volute shell enclosure (113). The cam (131) abuts against the side surface of the flexible volute tongue (1141) away from the impeller (12); the cam (131) rotates to control the flexible volute tongue (1141) to move closer to or further away from the air outlet baffle (115) along the circumferential direction of the volute casing (113).

5. The range hood according to claim 2, wherein the volute assembly (114) comprises a rigid volute tongue (1142) and a volute tongue baffle (1143). The rigid volute tongue (1142) protrudes towards the side closest to the impeller (12); the volute tongue baffle (1143) is fixed to the side of the rigid volute tongue (1142) away from the impeller (12); one end of the rigid volute tongue (1142) is movably connected to the air outlet baffle (115), and the other end of the rigid volute tongue (1142) is movably connected to the volute casing plate (113); The cam (131) abuts against the side surface of the volute tongue baffle (1143) away from the rigid volute tongue (1142); the cam (131) rotates to drive the volute tongue baffle (1143) to move the rigid volute tongue (1142) along the circumferential direction of the volute casing (113), closer to or away from the side of the air outlet baffle (115).

6. A control method for a range hood, used to control the range hood according to any one of claims 1-5, characterized in that, include: The operating parameters of the centrifugal fan are acquired in real time; the operating parameters include noise and air pressure at the air outlet. Determine the current operating speed of the centrifugal fan based on its current operating parameters; Based on the current operating gear, determine the target parameter range corresponding to the current operating gear; Based on the current operating parameters and the target parameter range, the worm tongue drive mechanism is controlled to drive the worm tongue assembly to move, so as to adjust the clearance size between the worm tongue assembly and the impeller.

7. The control method for a range hood according to claim 6, characterized in that, The centrifugal fan has multiple operating speed ranges, each speed range including at least one operating speed; the speed range includes a first speed range, a second speed range, and a third speed range; when the centrifugal fan operates at the first speed range, the wind force generated by the impeller is in the first wind force range; when the centrifugal fan operates at the second speed range, the wind force generated by the impeller is in the second wind force range; when the centrifugal fan operates at the third speed range, the wind force generated by the impeller is in the third wind force range. The wind force in the first wind force range is less than the wind force in the second wind force range, and the wind force in the second wind force range is less than the wind force in the third wind force range.

8. The control method for a range hood according to claim 7, characterized in that, Based on the current operating parameters of the centrifugal fan, determine the current operating level of the centrifugal fan, including: Determine whether the current operating parameters of the centrifugal fan meet the gear range conditions; the gear range conditions include whether the current noise in the current operating parameters is within a first noise range, or whether the current air pressure in the current operating parameters is within a third air pressure range; If not, then it is determined that the current operating speed of the centrifugal fan is within the second speed range.

9. The control method for a range hood according to claim 8, characterized in that, Determining the current operating level of the centrifugal fan based on its current operating parameters also includes: If the current noise in the current operating parameters is within the first noise range, then the current operating speed of the centrifugal fan is determined to be within the first speed range. If the current wind pressure in the current operating parameters is within the third wind pressure range, then the current operating speed of the centrifugal fan is determined to be within the third speed range.

10. The control method for a range hood according to claim 9, characterized in that, Based on the current operating gear, determine the target parameter range corresponding to the current operating gear, including: When the current operating speed of the centrifugal fan is within the first speed range, the target parameter range corresponding to the current operating speed includes the first air pressure range; When the current operating speed of the centrifugal fan is within the second speed range, the target parameter range corresponding to the current operating speed includes the second air pressure range and the second noise range. When the current operating speed of the centrifugal fan is within the third speed range, the target parameter range corresponding to the current operating speed includes the third noise range; Wherein, the noise in the first noise range is less than the noise in the second noise range, and the noise in the second noise range is less than the noise in the third noise range; the wind pressure in the first wind pressure range is less than the wind pressure in the second wind pressure range, and the wind pressure in the second wind pressure range is less than the wind pressure in the third wind pressure range.

11. The control method for a range hood according to claim 6, characterized in that, Based on the current operating parameters and the target parameter range, the volute tongue drive mechanism is controlled to drive the volute tongue assembly to move, thereby adjusting the clearance between the volute tongue assembly and the impeller, including: Determine whether the current noise and / or current wind pressure in the current operating parameters are within the range of the target parameters; If not, the worm tongue drive mechanism is controlled to drive the worm tongue assembly to move, thereby increasing the gap between the worm tongue assembly and the impeller.

12. The control method for a range hood according to claim 11, characterized in that, Also includes: During the process of controlling the volute tongue drive mechanism to drive the volute tongue assembly to move, the process returns to the steps of real-time acquisition of the centrifugal fan's operating parameters and determination of whether the current operating parameters meet the target parameter conditions, until the current operating parameters meet the target parameter conditions.

13. A control device for a range hood, used to control the range hood according to any one of claims 1-5, characterized in that, include: The parameter acquisition module is used to acquire the operating parameters of the centrifugal fan in real time; the operating parameters include noise and air pressure at the air outlet. The gear determination module is used to determine the current operating gear of the centrifugal fan based on the current operating parameters of the centrifugal fan. The parameter range determination module is used to determine the target parameter range corresponding to the current operating gear based on the current operating gear. The drive control module is used to control the worm tongue drive mechanism to drive the worm tongue assembly to move according to the current operating parameters and the target parameter range, so as to adjust the clearance size between the worm tongue assembly and the impeller.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the control method for the range hood according to any one of claims 6-12.

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