An impeller, a fume extraction device, and a control method for the fume extraction device.

Abstract

This invention belongs to the field of household appliance technology, and particularly relates to an impeller, a fan, a range hood, and a control method for the range hood. The impeller includes an impeller body and an adjustment assembly. The impeller body includes a frame and multiple blade assemblies arranged circumferentially along the frame. The blade assemblies are slidably connected to the frame, and the sliding direction is radial to the frame. The adjustment assembly is disposed on the frame and includes a drive component and a transmission structure. The transmission structure drives the drive component and the blade assemblies to drive the blade assemblies to slide. The diameter of the impeller is adjustable, allowing for adaptive adjustment of the impeller radius according to different cooking fume conditions. This ensures efficient smoke removal under heavy smoke conditions and achieves low-noise operation under light or no smoke conditions, balancing effective smoke extraction with a quiet user experience.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to an impeller, a fume extraction device, and a control method for the fume extraction device. Background Technology

[0002] Most existing household range hoods use centrifugal impellers with a fixed diameter, relying mainly on adjusting the motor speed to change airflow and air pressure. This makes it difficult to adapt to the varied oil fume conditions of Chinese cooking. With heavy oil fumes, the speed needs to be increased to ensure effective extraction, which easily generates significant aerodynamic and mechanical noise. With light or no oil fumes, the fixed impeller results in an "overpowered motor for a small load," leading to high energy consumption, excessive noise, and low energy efficiency. Furthermore, simply adjusting the speed cannot fundamentally resolve the contradiction between effective fume extraction and quiet operation, making it difficult to achieve the optimal balance between smoke removal, operating noise, and energy consumption across all cooking scenarios. Summary of the Invention

[0003] The purpose of this invention is to provide an impeller, a fume extraction device, and a control method for the fume extraction device, so as to solve the problem that a fixed diameter impeller is not compatible with the fume extraction conditions, resulting in a contradiction between fume extraction efficiency and quiet operation.

[0004] To achieve this objective, the present invention adopts the following technical solution: An impeller comprising: The impeller body includes a frame and a plurality of blade assemblies arranged circumferentially along the frame, the blade assemblies being movably connected to the frame. An adjustment component is disposed on the frame. The adjustment component includes a drive component and a transmission structure. The transmission structure is motive-connected to the drive component and the blade assembly to drive the blade assembly to move and adjust the diameter of the impeller.

[0005] As an alternative to the aforementioned impeller, the transmission structure includes: A rotating component, which is coaxially arranged and rotatably connected to the impeller body; Multiple transmission components are provided, which are connected to the rotating component and the blade assembly to drive the blade assembly to move.

[0006] As an alternative to the aforementioned impeller, the transmission component includes a connecting rod, which is arranged circumferentially with the blade assembly along the impeller body. One end of the connecting rod is rotatably connected to the rotating component, and the other end of the connecting rod is rotatably connected to the blade assembly.

[0007] As an alternative to the aforementioned impeller, one end of the connecting rod that connects to the rotating component points to the other end, and the radial angle between the connecting rod and the frame gradually increases; And / or, the frame is provided with a receiving groove, the side wall of the receiving groove is provided with a guide hole extending in the circumferential direction, the driving member and at least part of the rotating member are located in the receiving groove, and the connecting rod passes through the guide hole.

[0008] As an alternative to the aforementioned impeller, the connecting rod is an arc-shaped rod, or the connecting rod comprises at least two rod segments arranged at an angle.

[0009] As an alternative to the aforementioned impeller, the rotating component is provided with a guide groove, and the distance between the guide groove and the rotation center of the rotating component gradually increases from one end to the other along the circumference of the impeller body. The transmission component extends axially along the impeller body, with one end of the transmission component slidingly engaged with the guide groove and the other end connected to the blade assembly.

[0010] As an alternative to the aforementioned impeller, the rotating component includes a central cover and a synchronizing ring sleeved outside the central cover. The central cover is connected to the output end of the driving component and covers the driving component. The synchronizing ring is fixedly connected to the central cover, and the transmission component is connected to the synchronizing ring.

[0011] As an alternative to the aforementioned impeller, the blade assembly is slidably connected to the frame, and the sliding direction is radial to the frame; And / or, the frame includes a central portion and a plurality of guide sleeves spaced circumferentially along the central portion, the guide sleeves extending radially along the central portion, and the blade assembly includes a sliding portion that slidably passes through the guide sleeves; And / or, the impeller further includes a central shaft fixed to the frame, the driving component is a drive motor, the output shaft of the drive motor is sleeved outside the central shaft and connected to the transmission structure; And / or, multiple frames are provided, the multiple frames are spaced apart, two adjacent frames are connected by a connector, and the adjustment component is fixed to one of the frames; And / or, the blade assembly includes: Two end plates are spaced apart along the axial direction of the impeller body, the end plates extend circumferentially along the impeller body, and the width of the end plates gradually decreases along the rotation direction of the impeller; At least two blades are connected between the two end plates.

[0012] As an alternative to the aforementioned impeller, the guide sleeve is provided with a window extending radially along the center portion, and the transmission structure passes through the window and connects to the blade assembly; And / or, the blade is an arc-shaped plate; And / or, among the multiple blades of the same blade assembly, the exit angle of the blades gradually decreases along the rotation direction of the impeller; And / or, the blade assembly further includes a reinforcing member connecting the two end plates and located below the blade, the reinforcing member and / or the end plates being connected to a sliding portion that is slidably connected to the frame.

[0013] A fume extraction device, comprising: Main body of the range hood; A fan is disposed within the main body of the smoke hood. The fan includes a housing and the aforementioned impeller, the impeller being rotatably disposed within the housing. A data acquisition component is installed on the main body of the range hood and is used to collect information on the concentration of cooking fumes in the cooking environment. The data acquisition component is electrically connected to the adjustment component.

[0014] A control method for a fume extraction device, applied to the aforementioned fume extraction device, the control method comprising: Obtain information on the concentration of cooking fumes in the cooking environment; Based on the oil fume concentration information, the operating parameters of the oil fume extraction device are adjusted, including the diameter of the impeller.

[0015] As an optional solution for the control method of the above-mentioned fume extraction equipment, when adjusting the diameter of the impeller, the diameter of the impeller is directly proportional to the fume concentration; And / or, the operating parameters further include fan speed, the impeller diameter is related to the fan speed, and the control method of the fume extraction equipment further includes: Monitor the fan speed and adaptively adjust the impeller diameter based on the fan speed.

[0016] As an optional solution to the control method of the above-mentioned fume extraction equipment, adjusting the operating parameters of the fume extraction equipment specifically includes: The current cooking mode is identified based on the oil fume concentration information; Obtain historical operating parameters associated with the current cooking mode, including historical impeller diameter; The operation of the fume extraction device is controlled based on historical operating parameters; Alternatively, adjusting the operating parameters of the fume extraction device specifically includes: Based on the oil fume concentration information, the threshold range of the oil fume concentration is obtained; Based on the threshold range, obtain the corresponding target operating parameters; The operation of the fume extraction device is controlled based on the acquired target operating parameters.

[0017] As an optional solution to the control method of the above-mentioned fume extraction device, after adjusting the operating parameters of the fume extraction device, the following further steps are included: Monitor whether the user's fan speed adjustment command has been received; If so, in response to the fan speed adjustment command, the diameter of the impeller is adjusted, and the adjusted operating parameters are updated to the historical operating parameters; If not, obtain information on changes in the concentration of cooking fumes in the cooking environment. If the concentration of cooking fumes changes to a preset range, update the current working parameters to the historical working parameters. If the concentration of cooking fumes exceeds the preset range, adjust the working parameters according to the information on changes in the concentration of cooking fumes, and update the adjusted working parameters to the historical working parameters.

[0018] The beneficial effects of this invention are: The impeller provided by this invention has an adjustable diameter, which can adaptively adjust the diameter of the impeller according to different cooking fume conditions, ensuring efficient smoke removal when there is heavy smoke, and achieving low-noise operation when there is light smoke or no smoke, thus balancing the suction and exhaust effect with a quiet experience.

[0019] The use of the aforementioned impellers in fans and fume extraction equipment can solve the problem of mismatch between fixed-diameter impellers and fume extraction conditions, which leads to a contradiction between fume extraction efficiency and quiet operation.

[0020] The control method for the fume extraction device provided by this invention links the diameter of the impeller with the concentration of fumes and realizes automatic adjustment of the impeller diameter, which can match the cooking needs of all scenarios and solve the technical contradiction of balancing smoke removal effect and quiet operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the fume extraction device provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the fan provided in Embodiment 1 of the present invention; Figure 3 This is a cross-sectional view of the impeller with a larger diameter provided in Embodiment 1 of the present invention; Figure 4 This is a cross-sectional view of the impeller with a smaller diameter provided in Embodiment 1 of the present invention; Figure 5 This is a first sectional view of the impeller provided in Embodiment 1 of the present invention; Figure 6 This is an exploded view of the impeller provided in Embodiment 1 of the present invention; Figure 7 This is a second sectional view of the impeller provided in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the principle of the adjustment component provided in Embodiment 1 of the present invention; Figure 9 This is a cross-sectional view of the fan provided in Embodiment 1 of the present invention; Figure 10 yes Figure 9 A magnified view of a section at point D; Figure 11 This is a schematic diagram of the blade assembly provided in Embodiment 1 of the present invention; Figure 12 This is a cross-sectional view of the blade assembly provided in Embodiment 1 of the present invention; Figure 13 This is a first exploded view of the impeller provided in Embodiment 2 of the present invention; Figure 14 This is a second exploded view of the impeller provided in Embodiment 2 of the present invention; Figure 15 yes Figure 13 A magnified view of a section at point E in the middle; Figure 16 This is a cross-sectional view of the fan provided in Embodiment 3 of the present invention; Figure 17 yes Figure 16 A magnified view of a section at point F in the middle; Figure 18 This is a schematic diagram of the structure of the conductive component provided in Embodiment 3 of the present invention; Figure 19 This is a cross-sectional view of the conductive component provided in Embodiment 3 of the present invention; Figure 20 This is a schematic diagram of the structure of the conductive component and the central shaft when they are assembled, as provided in Embodiment 3 of the present invention; Figure 21 This is a flowchart of the control method for the fume extraction device provided in Embodiment 5 of the present invention; Figure 22 This is a flowchart of the control method for the fume extraction device provided in Embodiment Six of the present invention.

[0022] In the picture: 100. Fan; 10. Impeller; 11. Impeller body; 111. Frame; 111a. Middle frame; 111b. End frame; 1111. Center section; 1112. Guide sleeve; 112. Blade assembly; 1121. End plate; 11211. Sliding part; 1122. Blade; 1123. Reinforcing member; 113. Rod; 12. Adjusting assembly; 121. Drive component; 122. Rotating component; 1221. Center cover; 12211. Support; 1222. Synchronizing ring; 12221. Guide groove; 123. Transmission Moving parts; 13. Central shaft; 20. Housing; 21. Duct housing; 211. Air inlet; 212. Air outlet; 22. Mounting bracket; 30. Motor; 40. Conductive component; 41. Conductive element; 42. Conductive disk; 43. Insulating bracket; 431. First bracket; 432. Second bracket; 44. Interface bracket; 45. Insulating fastener; 46. Terminal block; 50. Duct bracket; 200. Main unit box; 210. Exhaust vent; 300. Smoke collection chamber; 400. Oil cup; 500. Data acquisition component; 600. Control panel. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1 like Figure 1 As shown, this embodiment provides a fume extraction device, including a range hood body and a fan 100 installed inside the range hood body. A flue gas channel is formed inside the range hood body. When the fan 100 is started, it can drive external fumes into the range hood body and discharge them outdoors through the flue gas channel to achieve the purpose of purifying the indoor environment.

[0028] In this embodiment, the main body of the smoke hood includes a main unit housing 200 and a smoke collection chamber 300 disposed below the main unit housing 200. The smoke collection chamber 300 has a smoke inlet and a filter element. The interior of the smoke collection chamber 300 communicates with the main unit housing 200. An exhaust vent 210 is located at the top of the main unit housing 200. A fan 100 is disposed inside the main unit housing 200 and communicates with the exhaust vent 210. When the fan 100 is started, the airflow passes through the filter element at the smoke inlet to filter out oil stains, then enters the smoke collection chamber 300, and under the drive of the fan 100, enters the main unit housing 200, and is then discharged through the exhaust vent 210.

[0029] In this embodiment, the fume extraction device is a side-suction type. The front surface of the smoke collection chamber 300 has a smoke inlet, and the front surface is inclined from top to bottom and then to the rear to avoid obstructing the space above the stove, making it convenient for the user to cook. It should be noted that the "front side" refers to the side of the fume extraction device facing the user, and the "rear side" refers to the side of the fume extraction device facing the mounting wall.

[0030] In order to collect the filtered oil, an oil cup 400 is provided at the bottom of the smoke collection chamber 300. Since the front surface of the smoke collection chamber 300 is inclined, the oil cup 400 is located at the bottom of the inclined surface, so that the oil accumulated on the filter element flows downward under the action of gravity and is collected in the oil cup 400.

[0031] In other embodiments, the fume extraction device may also be a downdraft hood or other forms of concealed hood, and there is no specific limitation.

[0032] To facilitate user operation, a control panel 600 is provided at the top front of the smoke collection chamber 300. The control panel 600 is electrically connected to the fan 100 so that users can control the start and stop of the fume extraction equipment and its operating parameters through the control panel 600.

[0033] In some other embodiments, the control panel 600 may also be located in other locations, which are not limited here.

[0034] To improve the intelligence and oil fume purification effect of the fume extraction equipment, a collection component 500 is installed on the smoke collection chamber 300. The collection component 500 is used to collect the oil fume concentration information of the cooking environment so as to intelligently adjust the working parameters of the fume extraction equipment according to the oil fume concentration.

[0035] In this embodiment, as Figure 1 and Figure 2 As shown, the fan 100 includes an impeller 10, a housing 20, and a motor 30. The housing 20 is provided with an air inlet 211 and an air outlet 212. The impeller 10 is rotatably disposed inside the housing 20. The motor 30 is disposed on the housing 20 and is connected to the impeller 10 for transmission, so that the impeller 10 is driven to rotate by the motor 30, thereby driving the airflow to enter the housing 20 through the air inlet 211 and then be discharged through the air outlet 212. The air inlet 211 is connected to the inside of the main unit 200, and the air outlet 212 is connected to the exhaust port 210.

[0036] In this embodiment, air inlets 211 are provided on both the left and right sides of the housing 20, the axis of the impeller 10 extends in the left and right direction, and the air outlet 212 is located at the top of the housing 20. The fumes entering the main unit housing 200 from the smoke collection chamber 300 are driven by the fan 100 and then enter the housing 20 through the air inlets 211 on the left and right sides, respectively, increasing the effective air intake area of ​​the fan 100 and thus improving the efficiency of fume extraction.

[0037] In some other embodiments, the two air inlets 211 may also be arranged in the front-to-back direction, and correspondingly, the axis of the impeller 10 extends in the front-to-back direction.

[0038] In some other embodiments, the housing 20 may be provided with only one air inlet 211, which may be oriented to the left or right, or to the front or rear, without limitation.

[0039] To facilitate fixing the fan 100, such as Figure 2 As shown, the fan 100 also includes a duct support 50, which is connected to the housing 20 and fixed to the main unit 200 to secure the fan 100 inside the main unit 200. The duct support 50 is located on the rear side of the housing 20 to avoid interfering with or obstructing the air inlets 211 on the left and right sides.

[0040] It is understandable that, such as Figure 3 and Figure 4As shown, with the dimensions of the casing 20 remaining constant, a larger diameter of the impeller 10 results in a higher linear velocity at its outer end, leading to stronger air-doping capabilities and the generation of higher static pressure. Higher static pressure translates to stronger resistance, effectively overcoming resistance even in situations with high resistance in the common flue or long flue pipes, ensuring that fumes are powerfully drawn away and reducing backflow and escape. Simultaneously, a larger effective sweeping area of ​​the impeller 10 allows for a greater volume of air to be drawn in a single rotation, resulting in a larger airflow at the same rotational speed and improved fume extraction. Correspondingly, the outer end of the impeller 10 is closer to the wall of the casing 20, leading to a larger airflow velocity gradient within the flow channel, which easily generates stronger turbulence and secondary flow, resulting in relatively higher aerodynamic noise.

[0041] Conversely, when the diameter of impeller 10 is smaller, the linear velocity at the outer end of the blades is lower, resulting in relatively lower static pressure. The effective sweeping area of ​​impeller 10 is also smaller, and the air volume generated under the condition that the speed of impeller 10 remains constant is relatively smaller, resulting in a relatively weaker oil fume extraction effect. However, the distance between the outer end of impeller 10 and the wall of casing 20 is greater, the airflow velocity inside casing 20 is smoother, the intensity of turbulence and eddies is reduced, and the aerodynamic noise is significantly reduced.

[0042] As can be seen from the above analysis, the diameter of the impeller 10 has opposite effects on the oil fume extraction effect and the quiet experience. The existing impeller 10 with a fixed diameter cannot balance the extraction effect and the quiet experience, thus affecting the user's experience.

[0043] To address the aforementioned issues, in this embodiment, the diameter of the impeller 10 is adjustable, allowing the radius of the impeller 10 to be adaptively adjusted according to different cooking fume conditions. This ensures efficient fume removal during heavy fume conditions and achieves low-noise operation during light or no fume conditions, balancing both suction and exhaust performance with a quiet experience.

[0044] Specifically, the impeller 10 includes an impeller body 11, an adjusting component 12, and a central shaft 13. The impeller body 11 and the central shaft 13 are coaxially arranged and connected. The central shaft 13 is connected to the output shaft of the motor 30 to realize the rotation of the impeller body 11. The impeller body 11 includes a frame 111 and a plurality of blade assemblies 112 arranged circumferentially along the frame 111. The blade assemblies 112 are slidably connected to the frame 111, and the sliding direction is radial to the frame 111. The adjusting component 12 is arranged on the frame 111 and is connected to the blade assemblies 112 in a transmission manner to drive the blade assemblies 112 to slide, thereby adjusting the diameter of the impeller 10. In this embodiment, the blade assembly 112 slides radially along the frame 111 to adjust the diameter of the impeller 10. The overall structure of the blade assembly 112 does not need to change, and the blade assembly 112 is always a whole, which is beneficial to improving the stability of the blade assembly 112. The adjustment assembly 12 provides the power for adjusting the diameter of the impeller 10. Compared with adjusting the diameter of the impeller by centrifugal force, the impeller 10 can maintain the same diameter at different speeds, making the diameter and speed of the impeller 10 two independent and adjustable variables. This makes the operation of the fume extraction equipment more flexible and better able to adapt to different user needs.

[0045] In some other embodiments, the blade assembly 112 and the frame 111 may be connected in other ways. The relative movement direction may be a single radial sliding or a compound movement including radial movement. There are no restrictions here, as long as the diameter of the impeller 10 can be adjusted.

[0046] To improve the stability of the impeller body 11, such as Figure 5 As shown, in this embodiment, three frames 111 are provided: a middle frame 111a and two end frames 111b. The three frames 111 are spaced apart along the axial direction of the central axis 13 and connected as a whole by a rod 113. The blade assembly 112 is slidably connected to each of the three frames 111 to improve the stability of the blade assembly 112. The adjusting component 12 is connected to the middle frame 111a so that the adjusting component 12 is located inside the impeller body 11, making full use of the internal space of the impeller body 11 and avoiding interference between the adjusting component 12 and the housing 20, which would affect the normal rotation of the impeller body 11.

[0047] In some other embodiments, the adjustment component 12 can be disposed on any of the frames 111, for example, on the end frame 111b, and the specific location is not limited.

[0048] In some other embodiments, the number of frames 111 can be set according to actual needs. For example, there may be only one frame 111, or there may be two, four or more frames 111.

[0049] like Figure 5 and Figure 6As shown, the adjustment assembly 12 includes a drive component 121, a rotating component 122, and multiple transmission components 123. The drive component 121 is mounted on the central frame 111a, and its output end is connected to the rotating component 122 to drive the rotating component 122 to rotate. The axis of the rotating component 122 coincides with the axis of the central shaft 13. Each blade assembly 112 is correspondingly provided with a transmission component 123, which drives the rotating component 122 and the blade assembly 112 to convert the rotation of the rotating component 122 into the sliding of the blade assembly 112, thereby adjusting the diameter of the impeller 10. In this embodiment, the rotating component 122 is coaxial with the central shaft 13, and the rotation of the rotating component 122 will not interfere with the blade assembly 112, which is beneficial to improving the synchronization of multiple blade assemblies 112 and the reliability of the impeller 10 structure.

[0050] like Figure 7 As shown, the transmission component 123 is a connecting rod, and the connecting rod and the blade assembly 112 are arranged circumferentially along the impeller body 11. One end of the connecting rod is rotatably connected to the rotating component 122, and the other end is rotatably connected to the blade assembly 112. Combined with the sliding fit between the blade assembly 112 and the central frame 111a, the rotating component 122, the transmission component 123, and the blade assembly 112 form a crank-slider structure.

[0051] like Figure 8 As shown, the rotation center of rotating component 122 is A, the hinge point between rotating component 122 and connecting rod is B, and the hinge point between connecting rod and blade assembly 112 is C. Therefore, rotating component 122 forms the crank AB of a crank-slider structure, and blade assembly 112 is the slider in the crank-slider structure. When rotating component 122... Figure 8 When rotated in the direction indicated by the middle arrow, crank AB and connecting rod rotate to the position indicated by the dotted line, causing blade assembly 112 to move radially toward the center to the position indicated by the dotted line, thereby reducing the diameter of impeller 10. When rotating member 122 rotates in the opposite direction, correspondingly, blade assembly 112 moves radially toward the edge, thereby increasing the diameter of impeller 10.

[0052] By setting the transmission component 123 as a connecting rod, the included angle between the connecting rod and the corresponding blade assembly 112 can change as the rotating component 122 rotates. The overall space occupied by the adjustment component 12 is small and the structure is more compact, so as to avoid structural interference.

[0053] To make the structure of the adjusting component 12 more compact, one end of the connecting rod connecting the rotating component 122 points to the other end, and the angle between the connecting rod and the sliding direction of the blade assembly 112 gradually increases. This arrangement can reduce the distance between the hinge point B and the corresponding blade assembly 112, making the arrangement of the blade assembly 112 and the connecting rod more compact and avoiding interference between the connecting rod and the adjacent frame 111.

[0054] In this embodiment, the connecting rod includes two rod segments arranged at an angle, which helps to reduce the distance between the hinge point B and the corresponding blade assembly 112.

[0055] In other embodiments, the link may include three, four or more segments, the number of which can be set according to actual needs.

[0056] In other embodiments, the connecting rod can be an arc-shaped rod, or it can satisfy the above-mentioned angle change relationship between the connecting rod and the sliding direction of the blade assembly 112.

[0057] like Figure 9 and Figure 10 As shown, the drive component 121 is a drive motor. The drive component 121 is fixed on the middle frame 111a and sleeved on the central shaft 13. The output shaft of the drive component 121 is a hollow shaft, which is sleeved on the outside of the central shaft 13 to ensure that the output shaft of the drive component 121 coincides with the axis of the central shaft 13.

[0058] To protect the drive component 121, combined with Figure 7 and Figure 10 As shown, the rotating component 122 includes a central cover 1221 and a synchronizing ring 1222 sleeved outside the central cover 1221. The central cover 1221 is connected to the output end of the driving component 121 and covers the driving component 121. The synchronizing ring 1222 is fixedly connected to the central cover 1221, and the transmission component 123 is connected to the synchronizing ring 1222. By covering the driving component 121 with the central cover 1221, the driving component 121 can be protected, preventing oil fumes from affecting the normal operation of the driving component 121. By connecting multiple links with the synchronizing ring 1222, the synchronization of multiple links can be improved.

[0059] Optionally, a support 12211 is provided on the circumferential outer wall of the center cover 1221, and the synchronization ring 1222 is fixedly connected to the support 12211 so that the synchronization ring 1222 can be sleeved on the outside of the center cover 1221 and fixedly connected to the center cover 1221.

[0060] To facilitate the connection between the connecting rod and the blade assembly 112, such as Figure 10 As shown, the middle frame 111a is provided with a receiving groove, and the drive member 121 and at least part of the rotating member 122 are located in the receiving groove so that the middle frame 111a and the rotating member 122 are nested together, which facilitates the connection of the connecting rod on the rotating member 122 to correspond with the position of the blade assembly 112, so that the connecting rod and the blade assembly 112 can be on the same radial interface, reducing the axial dimension of the connecting rod along the central axis 13.

[0061] Optionally, the sidewall of the receiving groove is provided with a guide hole extending circumferentially, through which the connecting rod passes. The guide hole serves two purposes: firstly, it guides the movement of the connecting rod, preventing it from becoming misaligned; secondly, the connecting rod passing through the guide hole facilitates the nesting of the rotating component 122 with the central frame 111a, resulting in a more compact structure and reducing the overall axial dimension along the central axis 13 after mating.

[0062] like Figure 11 As shown, the blade assembly 112 includes two end plates 1121 spaced apart along the axial direction of the impeller body 11. The end plates 1121 extend circumferentially along the impeller body 11, and at least two blades 1122 are disposed between the two end plates 1121. The at least two blades 1122 are spaced apart circumferentially along the impeller body 11 to form an air outlet gap. Each blade assembly 112 includes at least two blades 1122 fixed together by the end plates 1121, which can divide all the blades 1122 of the impeller 10 into multiple groups. The multiple blades 1122 in the same group can be synchronously adjusted in the radial position along the impeller body 11, which can reduce the number of transmission components 123, simplify the structure, and reduce costs.

[0063] To facilitate the sliding fit between the blade assembly 112 and the frame 111, combined with Figure 6 and Figure 11 As shown, the frame 111 includes a central portion 1111 and a plurality of guide sleeves 1112 arranged circumferentially along the central portion 1111. The guide sleeves 1112 extend radially along the central portion 1111. The blade assembly 112 also includes a sliding portion 11211, which slides through the guide sleeves 1112 to achieve sliding engagement between the blade assembly 112 and the frame 111.

[0064] The guide sleeve 1112 is provided with a window extending radially along the frame 111 so that the sliding part 11211 inside the guide sleeve 1112 is exposed, which facilitates the hinge connection between the sliding part 11211 and the connecting rod.

[0065] In this embodiment, a hinge seat protrudes from the sliding part 11211. The hinge seat extends out of the window and can slide within the window. The connecting rod is hinged to the hinge seat to achieve a rotational connection between the connecting rod and the sliding part 11211.

[0066] To improve the stability and strength of the blade assembly 112, the blade assembly 112 also includes a reinforcing member 1123. The reinforcing member 1123 connects the two end plates 1121 and is located below the blade 1122, which can improve the overall strength of the blade assembly 112 and reduce the probability of the blade assembly 112 bending, deforming or being damaged.

[0067] Optionally, the cross-section of the reinforcing member 1123 may be T-shaped to further improve the structural strength.

[0068] In this embodiment, both the reinforcing member 1123 and the end plate 1121 are connected to sliding parts 11211. Each sliding part 11211 is slidably engaged with a guide sleeve 1112 on a frame 111, so that the blade assembly 112 is more stable during sliding and the synchronization of the blade assembly 112 along its length direction is improved.

[0069] like Figure 11 As shown, each end plate 1121 extends downward to form a sliding portion 11211, thereby reducing the number of parts and facilitating processing. In other embodiments, the sliding portion 11211 can be separately formed from the end plate 1121 and then fixed by means of screw connection, snap-fit, welding, etc.

[0070] In other embodiments, the number and location of the sliding parts 11211 can be set according to actual needs, as long as they slide in cooperation with the frame 111. For example, the sliding parts 11211 can be provided only on the end plate 1121 or only on the reinforcing member 1123.

[0071] To reduce wind resistance, the end plate 1121 has rounded corners at both ends along the circumference of the frame 111. Compared with the sharp corner structure, it is safer and easier to install. The rounded corners also help to reduce wind resistance and improve the performance of the fan 100.

[0072] like Figure 12 As shown, to reduce wind resistance, the width of the end plate 1121 gradually decreases along the rotation direction of the impeller 10. That is, at both ends of the end plate 1121 along the circumference of the frame 111, the end facing the front of the rotation direction is narrower and the other end is wider, so that the end of the end plate 1121 facing the airflow is smaller, reducing the resistance to the airflow, which is beneficial to improving the performance of the fan 100.

[0073] In this embodiment, the blade 1122 is an arc-shaped plate, and the axis of the arc-shaped plate is parallel to the axis of the impeller body 11. The arc-shaped blade 1122 can smoothly guide the airflow direction, making the airflow flow out more smoothly and reducing airflow impact and energy loss; moreover, the arc-shaped blade 1122 has better structural strength and better bending resistance. When the impeller 10 rotates at high speed, the blade 1122 bears a large centrifugal force, and the arc-shaped blade 1122 can distribute stress more evenly and reduce stress concentration.

[0074] In some other embodiments, the blade 1122 may also be flat, and this is not a limitation.

[0075] To improve the performance of the fan 100, among the multiple blades 1122 of the same blade assembly 112, the projection shape of the blade 1122 on the end plate 1121 is an arc shape that bends toward the front side of the impeller 10, that is, the blade 1122 is an arc blade, which is beneficial to improve the performance of the fan 100.

[0076] The centers of the arc-shaped projections formed by multiple blades 1122 do not coincide, thus allowing the exit angles of the blades 1122 to be different. Optionally, along the rotation direction of the impeller 10, the exit angle of the blades 1122 gradually decreases, and the multiple blades 1122 gradually change from forward-curved blades to radial blades, reducing noise and energy loss while maintaining static pressure. It should be noted here that the exit angle of the blade 1122 refers to the angle between the tangent of the blade profile at the exit end of the blade 1122 and the tangent of the impeller 10 circumference. At the same rotational speed, forward-curved blades perform more work on the gas, followed by radial blades; however, in terms of efficiency and noise, forward-curved blades have higher energy loss and lower efficiency due to the higher outlet airflow velocity, and are also noisier. Conversely, radial blades are superior to forward-curved blades in terms of efficiency and noise. Therefore, by gradually reducing the exit angle of the blades 1122, the work performance of the blades 1122 can be guaranteed, efficiency can be optimized, and noise can be reduced, significantly improving the performance of the fan 100.

[0077] Example 2 This embodiment provides a fume extraction device, which has a structure that is roughly the same as the fume extraction device in Embodiment 1, except that the structure of the adjustment component 12 is different.

[0078] like Figures 13-15 As shown, the rotating component 122 is provided with a guide groove 12221. Along the circumference of the impeller body 11, the distance between the guide groove 12221 and the rotation center of the rotating component 122 gradually increases from one end to the other. The transmission component 123 extends along the axial direction of the impeller body 11. One end of the transmission component 123 is slidably engaged with the guide groove 12221, and the other end is connected to the blade assembly 112.

[0079] Specifically, the guide groove 12221 is provided on the synchronization ring 1222. The guide groove 12221 is an arc-shaped groove and extends spirally around the axis of the synchronization ring 1222. When the synchronization ring 1222 rotates, the groove wall of the guide groove 12221 can push the transmission component 123 to slide relative to each other in the guide groove 12221. Thus, under the restriction of the sliding fit between the blade assembly 112 and the frame 111, the blade assembly 112 is pushed to move radially along the frame 111, thereby realizing the adjustment of the diameter of the impeller 10.

[0080] Example 3 This embodiment provides a fume extraction device, which is a further improvement on the first and second embodiments. It provides a rotatable wiring structure, which enables the adjustment component 12 to move synchronously with the impeller 10 and maintain smooth power supply. This avoids problems such as tangling and breakage that occur when using wire harness connections, and improves the operational reliability and service life of the adjustment component 12.

[0081] like Figure 16 and Figure 17As shown, the fan 100 also includes a conductive assembly 40, which includes a terminal block 46, a conductive element 41, and a conductive disk 42. The terminal block 46 and the conductive disk 42 are both mounted on the housing 20 and insulated from it. The conductive element 41 passes through the central shaft 13 and is electrically connected to the adjusting assembly 12. The conductive disk 42 is coaxially mounted with the central shaft 13 and can rotate synchronously. The conductive element 41 is electrically connected to and fixed to the conductive disk 42. The terminal block 46 is in sliding contact with the conductive disk 42 and is used to connect to an external power source. In this conductive assembly 40, both the conductive element 41 and the conductive disk 42 can rotate with the impeller 10, and the conductive disk 42 can rotate relative to the housing 20 to ensure a reliable electrical connection between them. The terminal block 46 is fixed to the housing 20 and always in sliding contact with the conductive disk 42 to maintain a dynamic conductive state. The conductive component 40 adopts a rotatable wiring structure, which enables the regulating component 12 to move synchronously with the impeller 10 and maintain smooth power supply, avoiding problems such as tangling and breakage caused by wire harness connection, and improving the operational reliability and service life of the regulating component 12.

[0082] Optionally, the conductive element 41 can be a wire, or a conductive rod or conductive sheet made of conductive material, without limitation.

[0083] Optionally, the end of the conductive element 41 forms a contact portion, which slides in contact with the conductive disk 42 to increase the contact area and ensure good contact.

[0084] To ensure effective contact, the contact portion contacts the axial end face of the conductive disk 42. Because the axial end face of the conductive disk 42 has a large area, it can accommodate positional errors when mating with the contact portion, ensuring sufficient contact between the contact portion and the conductive disk 42 to guarantee reliable electrical connection.

[0085] To meet the power supply and control connection requirements of the regulating component 12, the conductive component 41 includes multiple wire harnesses, each wire harness is provided with a corresponding conductive disk 42, the multiple conductive disks 42 are arranged along the axial direction of the central axis 13 and are insulated, and each wire harness is electrically connected to the corresponding conductive disk 42 to meet the circuit connection requirements.

[0086] To ensure that each wire can contact the corresponding conductive disk 42, a central hole is provided on the conductive disk 42, making the conductive disk 42 a ring structure. The wire can pass through the central hole of the conductive disk 42 on the front side and then contact the corresponding conductive disk 42 on the rear side, so that the multiple wires embedded in the central shaft 13 can contact and conduct with the corresponding conductive disk 42 respectively.

[0087] Optionally, one end of the wire is bent to form an eccentric contact portion so that the contact portion avoids the area where the central hole is set, ensuring that the contact portion contacts the physical position of the conductive disk 42.

[0088] To ensure electrical safety, the conductive component 40 also includes an insulating bracket 43, which is fixedly connected to the housing 20. The conductive disk 42 is rotatably disposed inside the insulating bracket 43. The insulating bracket 43 is provided with a through hole that cooperates with the conductive element 41. The conductive element 41 extends into the insulating bracket 43 through the through hole and can rotate relative to the insulating bracket 43, so as to avoid being obstructed by the insulating bracket 43 during the rotation of the conductive element 41 and the conductive disk 42 driven by the impeller 10.

[0089] For ease of assembly, such as Figure 18 and Figure 19 As shown, the insulating support 43 includes a first support 431 and a second support 432 that can be detachably connected. The first support 431 and the second support 432 together form a receiving cavity, in which the conductive disk 42 is rotatably disposed. The assembly and disassembly of the first support 431 and the second support 432 facilitate the assembly of the conductive disk 42.

[0090] Optionally, the first bracket 431 and the second bracket 432 are fixedly connected by screws, which is convenient to fix and has a simple structure.

[0091] Optionally, an annular positioning groove is provided in the insulating bracket 43, and the outer edge of the conductive disk 42 is embedded in the positioning groove to restrict the conductive disk 42 from rotating in the positioning groove, thereby providing a positioning effect for the conductive disk 42 along the central axis 13 and preventing adjacent conductive disks 42 from contacting and short-circuiting, thus ensuring circuit safety.

[0092] To ensure that the conductive disk 42 can rotate synchronously with the impeller 10, the conductive assembly 40 also includes an insulating fastener 45. The insulating fastener 45 passes through multiple conductive disks 42 in sequence and is connected and fixed to the central shaft 13, so that the conductive disk 42 can be driven to rotate synchronously with the central shaft 13 through the insulating fastener 45.

[0093] In this embodiment, the insulating fastener 45 is an insulating pin. For example... Figure 20 As shown, during the assembly of the conductive component 40, insulating pins are first passed through multiple conductive disks 42 in sequence. Then, the insulating pins and conductive disks 42 are placed into the positioning grooves of the insulating bracket 43, and the first bracket 431 and the second bracket 432 are fixed. Finally, the insulating pins are inserted into the central shaft 13 to fix the conductive disks 42 to the central shaft 13.

[0094] In other embodiments, the insulating fastener 45 may also be other structures, such as insulating screws or insulating claws, etc., which are not limited here.

[0095] In this embodiment, the insulating bracket 43 is fixed to the housing 20. By controlling the positional accuracy of the insulating bracket 43, the gap between the groove wall of the positioning groove and the conductive disk 42 can be controlled, thereby reducing the friction between the insulating bracket 43 and the conductive disk 42, thereby reducing the resistance encountered by the impeller 10 when rotating, which is beneficial to improving the performance of the fan 100.

[0096] To facilitate maintenance of the circuit connection, the insulating bracket 43 is detachably mounted on the outside of the housing 20. This makes it easier to disassemble and install during maintenance, and also ensures that the insulating bracket 43 does not occupy the internal space of the housing 20, thus avoiding interference with the impeller 10 and preventing any impact on the performance of the fan 100.

[0097] In this embodiment, the housing 20 includes a fixedly connected duct housing 21 and a mounting bracket 22. The impeller 10 is rotatably disposed inside the duct housing 21. The duct housing 21 is provided with an air inlet 211. The mounting bracket 22 is disposed on the outside of the duct housing 21 and is correspondingly disposed with respect to the air inlet 211. The mounting bracket 22 is provided with a hollow area to reduce the impact on the air intake. An insulating bracket 43 is disposed on the mounting bracket 22.

[0098] To increase the air intake area of ​​the fan 100, two air inlets 211 are provided on the duct housing 21. Each air inlet 211 is provided with a corresponding mounting bracket 22. The motor 30 is fixed on one of the mounting brackets 22, and the insulating bracket 43 is fixed on the other mounting bracket 22.

[0099] The conductive component 40 also includes an interface bracket 44, which is generally in the shape of a cover and is fastened to the mounting bracket 22. An insulating bracket 43 is disposed on the side of the interface bracket 44 facing the mounting bracket 22, so that the insulating bracket 43 and the mounting bracket 22 are spaced apart for easy installation.

[0100] Example 4 This embodiment provides a fume extraction device, which differs from Embodiment 3 in that the wiring terminal 46 is in conductive contact with and fixed to the conductive disk 42, and the conductive disk 42 is in sliding contact with the conductive component 41.

[0101] Specifically, the conductive disk 42 is fixedly mounted inside the insulating bracket 43. The contact portion of the conductive element 41 rotates with the impeller 10 and slides in contact with the conductive disk 42 to achieve dynamic conductivity. In this embodiment, it is not necessary to provide an insulating fixing element 45; the conductive disk 42 can be fixed to the housing 20 by the insulating bracket 43.

[0102] Example 5 This embodiment provides a control method for a fume extraction device, which can be applied to the fume extraction device provided in any of the above embodiments, so that the diameter of the impeller 10 can be automatically adjusted according to the fume concentration, matching the cooking needs of all scenarios and solving the technical contradiction of balancing smoke removal effect and quiet operation.

[0103] The control method for the fume extraction device provided in this embodiment acquires information on the concentration of cooking fumes in the cooking environment and adjusts the operating parameters of the fume extraction device based on this information. These operating parameters include the diameter of the impeller 10. By correlating the diameter of the impeller 10 with the fume concentration and achieving automatic adjustment of the impeller 10 diameter, the method can meet the needs of cooking in all scenarios and resolve the technical contradiction between effective fume extraction and quiet operation.

[0104] It should be noted that, with other structural and dimensional parameters of the fume extraction equipment remaining constant, a larger impeller diameter (10) results in higher static pressure. Higher static pressure translates to stronger resistance, effectively overcoming resistance even in situations with high resistance in the common flue or long flue, ensuring powerful fume extraction and reducing backflow and escape. Simultaneously, a larger effective sweeping area of ​​the impeller (10) allows for a larger volume of air transported per rotation, resulting in greater airflow at the same rotation speed and improved fume extraction. However, this also makes it easier to generate turbulence and secondary flow, leading to relatively higher startup noise. Conversely, a smaller impeller diameter results in lower linear velocity at the outer end of the blades (1122), lower static pressure, a smaller effective sweeping area, and a smaller airflow at a constant impeller speed, leading to weaker fume extraction. However, a larger distance between the outer end of the impeller (10) and the wall of the casing (20) results in a smoother airflow velocity within the casing (20), reduced turbulence and eddy current intensity, and significantly reduced aerodynamic noise.

[0105] Therefore, in this embodiment, the diameter of the impeller 10 is proportional to the concentration of oil fumes. When the detected oil fume concentration is high, the diameter of the impeller 10 will be increased accordingly to ensure the smoke removal effect, sacrificing some noise reduction performance; conversely, when the detected oil fume concentration is low, the diameter of the impeller 10 will be decreased accordingly to reduce noise and improve the user experience while ensuring the smoke extraction effect.

[0106] In this embodiment, the operating parameters also include the fan speed, which is related to the diameter of the impeller 10. During the operation of the fume extraction device, the fan speed is monitored, and the diameter of the impeller 10 is adaptively adjusted according to the fan speed. It is understandable that, while maintaining a constant fan speed, simply adjusting the impeller 10 diameter is insufficient to adapt to actual operating conditions. Therefore, by linking the fan speed to the impeller 10 diameter, a collaborative control logic is established for the fume concentration, impeller 10 diameter, and fan speed, forming a closed-loop adaptive control. This automatically matches the cooking needs of all scenarios, resolving the technical contradiction between effective fume extraction and quiet operation, and comprehensively improving the user experience and product performance.

[0107] To adapt to cooking needs, such as Figure 21 As shown, before adjusting the diameter of the impeller 10, the current cooking mode is identified based on the oil fume concentration information; historical operating parameters associated with the current cooking mode are obtained, including historical impeller diameter and historical fan speed; and the operation of the oil fume extraction equipment is controlled based on the historical parameter information.

[0108] It's understandable that different cooking methods produce varying concentrations of cooking fumes. Therefore, by acquiring information about the concentration of cooking fumes in the cooking environment, the current cooking mode can be determined. Cooking modes include stir-frying, stewing, and deep-frying. By combining historical operating parameters associated with the current cooking mode, the operation of the fume extraction equipment can be controlled, providing personalized adaptation and continuous optimization to suit complex and ever-changing user cooking habits.

[0109] To more accurately determine the current cooking mode, user operation information can be obtained before identifying the current cooking mode. This information, including the selected fan speed setting, is then used to determine the current cooking mode. It's understandable that different users have different cooking and usage habits, and judging the cooking mode solely based on the smoke concentration will introduce some error. Therefore, combining the user's selected fan speed setting aligns with their usage habits, improving the accuracy of cooking mode recognition.

[0110] To iterate and update historical operating parameters, after adjusting the operating parameters of the fume extraction equipment, the historical operating parameters associated with the current cooking mode can be updated based on information on changes in fume concentration and secondary user operations.

[0111] Specifically, it monitors whether the user's fan speed adjustment command has been received; If a user's fan speed adjustment command is received, it indicates that the user has performed a secondary operation. This means that the fan speed and impeller diameter in the historical operating parameters cannot meet the user's needs. Therefore, in response to the fan speed adjustment command, the impeller diameter is adaptively adjusted, and the adjusted operating parameters are updated to the historical operating parameters. It should be noted that the range hood may have a pre-set data table for fan speed and impeller diameter, allowing the corresponding impeller diameter to be obtained by looking up the table; alternatively, the range hood may have a pre-set formula relating fan speed and impeller diameter, allowing the corresponding impeller diameter to be calculated.

[0112] If no user's fan speed adjustment command is received, the system obtains information on changes in the concentration of cooking fumes in the cooking environment. If the fume concentration changes to the preset range, it means that the historical operating parameters can meet the user's needs, and the current operating parameters are updated to the historical operating parameters, or the historical operating parameters do not need to be updated. If the fume concentration exceeds the preset range, the historical operating parameters do not match the current actual needs, and the range hood needs to adaptively adjust its operating parameters according to the fume concentration change information, and update the adjusted operating parameters to the historical operating parameters, so that subsequent scene recognition and parameter recommendations are more in line with the user's personalized cooking habits.

[0113] Example 6 This embodiment provides a control method for a fume extraction device, which differs from Embodiment 5 in the specific steps for adjusting the operating parameters of the fume extraction device.

[0114] like Figure 22 As shown, in this embodiment, the threshold range of the oil fume concentration is obtained based on the oil fume concentration information; the corresponding target operating parameters are obtained based on the threshold range; and the operation of the oil fume extraction device is controlled based on the obtained target operating parameters. This embodiment employs threshold-based rigid control, which directly matches the target operating parameters corresponding to the current level by dividing the oil fume concentration into different levels. The logic is simple, the response is immediate, and it is adaptable to standardized oil fume emission scenarios.

[0115] For example, when the oil fume concentration is greater than zero and less than the first oil fume threshold C1, the oil fume extraction device switches to a low setting, the fan 100 rotates at the first set speed N1, and the impeller 10 has a diameter of the first diameter R1. When the oil fume concentration is greater than or equal to the first oil fume threshold C1 and less than the second oil fume threshold C2, the oil fume extraction device switches to medium speed, the fan 100 rotates at the first set speed N1, and the impeller 10 has a diameter of the second diameter R2, wherein the second diameter R2 is greater than the first diameter R1.

[0116] When the oil fume concentration is greater than or equal to the second oil fume threshold C2, the oil fume extraction equipment switches to the high setting, the fan 100 rotates at the second set speed N2, and the impeller 10 has a diameter of the second diameter R2, wherein the second set speed N2 is greater than the first set speed N1.

[0117] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An impeller, characterized in that, include: Impeller body (11), the impeller body (11) includes a frame (111) and a plurality of blade assemblies (112) arranged circumferentially along the frame (111), the blade assemblies (112) being movably connected to the frame (111); An adjustment component (12) is disposed on the frame (111). The adjustment component (12) includes a drive component (121) and a transmission structure. The transmission structure drives the drive component (121) and the blade assembly (112) to drive the blade assembly (112) to move and adjust the diameter of the impeller.

2. The impeller according to claim 1, characterized in that, The transmission structure includes: Rotating component (122), which is coaxially arranged and rotatably connected to the impeller body (11); Multiple transmission components (123) are connected to the rotating component (122) and the blade assembly (112) to drive the blade assembly (112) to move.

3. The impeller according to claim 2, characterized in that, The transmission component (123) includes a connecting rod, which is arranged circumferentially with the blade assembly (112) along the impeller body (11). One end of the connecting rod is rotatably connected to the rotating component (122), and the other end of the connecting rod is rotatably connected to the blade assembly (112).

4. The impeller according to claim 3, characterized in that, The connecting rod connects one end of the rotating member (122) to the other end, and the radial angle between the connecting rod and the frame (111) gradually increases; And / or, the frame (111) is provided with a receiving groove, the side wall of the receiving groove is provided with a guide hole extending in the circumferential direction, the driving member (121) and at least part of the rotating member (122) are located in the receiving groove, and the connecting rod passes through the guide hole.

5. The impeller according to claim 4, characterized in that, The connecting rod is an arc-shaped rod, or the connecting rod comprises at least two rod segments arranged at an angle.

6. The impeller according to claim 2, characterized in that, The rotating component (122) is provided with a guide groove (12221). Along the circumference of the impeller body (11), the distance between the guide groove (12221) and the rotation center of the rotating component (122) gradually increases from one end to the other. The transmission component (123) extends along the axial direction of the impeller body (11), one end of the transmission component (123) is slidably engaged with the guide groove (12221), and the other end is connected to the blade assembly (112).

7. The impeller according to any one of claims 2-6, characterized in that, The rotating component (122) includes a central cover (1221) and a synchronization ring (1222) sleeved outside the central cover (1221). The central cover (1221) is connected to the output end of the driving component (121) and covers the driving component (121). The synchronization ring (1222) is fixedly connected to the central cover (1221). The transmission component (123) is connected to the synchronization ring (1222).

8. The impeller according to any one of claims 1-6, characterized in that, The blade assembly (112) is slidably connected to the frame (111), and the sliding direction is the radial direction of the frame (111); And / or, the frame (111) includes a central portion (1111) and a plurality of guide sleeves (1112) arranged circumferentially spaced along the central portion (1111), the guide sleeves (1112) extending radially along the central portion (1111), and the blade assembly (112) includes a sliding portion (11211) that slides through the guide sleeves (1112); And / or, the impeller also includes a central shaft (13) fixed to the frame (111), the driving component (121) is a drive motor, the output shaft of the drive motor is sleeved outside the central shaft (13) and connected to the transmission structure; And / or, multiple frames (111) are provided, the multiple frames (111) are spaced apart, two adjacent frames (111) are connected by a connector, and the adjustment component (12) is fixed to one of the frames (111); And / or, the blade assembly (112) includes: Two end plates (1121) are spaced apart along the axial direction of the impeller body (11), the end plates (1121) extend circumferentially along the impeller body (11), and the width of the end plates (1121) gradually decreases along the rotation direction of the impeller. At least two blades (1122) are connected between the two end plates (1121).

9. The impeller according to claim 8, characterized in that, The guide sleeve (1112) is provided with a window extending radially along the center portion (1111), and the transmission structure passes through the window and connects to the blade assembly (112). And / or, the blade (1122) is an arc-shaped plate; And / or, among the multiple blades (1122) of the same blade assembly (112), the exit angle of the blade (1122) gradually decreases along the rotation direction of the impeller; And / or, the blade assembly (112) further includes a reinforcing member (1123) that connects the two end plates (1121) and is located below the blade (1122), and the reinforcing member (1123) and / or the end plates (1121) are connected to a sliding part (11211) that is slidably connected to the frame (111).

10. A fume extraction device, characterized in that, include: Main body of the range hood; A fan, wherein the fan is disposed within the main body of the smoke hood, the fan comprising a housing (20) and an impeller as described in any one of claims 1-9, the impeller being rotatably disposed within the housing (20); A data acquisition component (500) is installed on the main body of the range hood and is used to collect information on the concentration of oil fumes in the cooking environment. The data acquisition component (500) is electrically connected to the adjustment component (12).

11. A control method for a fume extraction device, characterized in that, The method for controlling the fume extraction device according to claim 10 includes: Obtain information on the concentration of cooking fumes in the cooking environment; Based on the oil fume concentration information, the operating parameters of the oil fume extraction device are adjusted, including the diameter of the impeller.

12. The control method for the fume extraction device according to claim 11, characterized in that, When adjusting the diameter of the impeller, the diameter of the impeller is directly proportional to the concentration of oil fumes; And / or, the operating parameters further include fan speed, the impeller diameter is related to the fan speed, and the control method of the fume extraction equipment further includes: Monitor the fan speed and adaptively adjust the impeller diameter based on the fan speed.

13. The control method for the fume extraction device according to claim 11, characterized in that, Adjusting the operating parameters of the fume extraction device specifically includes: The current cooking mode is identified based on the oil fume concentration information; Obtain historical operating parameters associated with the current cooking mode, including historical impeller diameter; The operation of the fume extraction device is controlled based on historical operating parameters; Alternatively, adjusting the operating parameters of the fume extraction device specifically includes: Based on the oil fume concentration information, the threshold range of the oil fume concentration is obtained; Based on the threshold range, obtain the corresponding target operating parameters; The operation of the fume extraction device is controlled based on the acquired target operating parameters.

14. The control method for the fume extraction device according to claim 13, characterized in that, After adjusting the operating parameters of the fume extraction device, the following is also included: Monitor whether the user's fan speed adjustment command has been received; If so, in response to the fan speed adjustment command, the diameter of the impeller is adjusted, and the adjusted operating parameters are updated to the historical operating parameters; If not, obtain information on changes in the concentration of cooking fumes in the cooking environment. If the concentration of cooking fumes changes to a preset range, update the current working parameters to the historical working parameters. If the concentration of cooking fumes exceeds the preset range, adjust the working parameters according to the information on changes in the concentration of cooking fumes, and update the adjusted working parameters to the historical working parameters.

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