Impeller, fan comprising same, range hood, and range hood cleaning method

Abstract

The application discloses a kind of impeller, containing its fan, range hood and range hood cleaning method, impeller includes elastic connecting portion, blade, cleaning piece and middle disc, one end of blade is connected to elastic connecting portion, and blade extends towards the central axis direction of the direction of rotation of impeller, one end of elastic connecting portion is fixed to middle disc, blade moves to the direction of moving away from the center of impeller due to the rotation of impeller, and drives elastic connecting portion to occur deformation, cleaning piece is sleeved on blade and can reciprocate along the extension direction of blade, and has a normal working state and a self-cleaning state, cleaning piece arranged on blade can reciprocate in the extension direction of blade according to the rotation speed of impeller and clean oil stain on blade, without increasing waterway, circuit and other components required by heating, water flow and ultrasonic and the like mode, and without increasing additional power source, reduce system complexity, save cost and improve system reliability.

Description

Technical Field

[0001] This invention relates to an impeller, a fan including the impeller, a range hood, and a method for cleaning the range hood. Background Technology

[0002] Fan impeller blades operating in a kitchen environment accumulate significant amounts of grease, leading to deterioration of the impeller's dynamic balance and consequently, substantial vibration and noise in the fan system. To address this issue, automated, periodic cleaning of the blade surface can ensure the impeller's dynamic balance is maintained at a good level. Existing automated cleaning methods often employ heating, water flow, and ultrasonic cleaning; however, these methods inevitably require additional water and electrical circuits to function, increasing system cost, complexity, and reducing reliability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defect that the self-cleaning of impeller blades in the prior art requires the addition of additional water or electrical circuits, and to provide an impeller, a fan containing the impeller, a range hood, and a method for cleaning the range hood.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] An impeller, characterized in that it includes an elastic connecting portion, blades, a cleaning component, and a central disk. One end of each blade is connected to the elastic connecting portion and extends along the central axis of the impeller's rotation direction. One end of the elastic connecting portion is fixed to the central disk. The blades move away from the impeller's center due to the impeller's rotation, causing the elastic connecting portion to deform. The cleaning component is fitted onto the blades and can reciprocate along the blades' extension direction. It has a normal operating state and a self-cleaning state. When in the normal operating state... In the working state, the angle θ between the contact point of the inner edge of the blade and the cleaning component along the tangent direction of the inner edge of the blade and the perpendicular line to the central axis of the impeller rotation direction is less than 90°. At this time, the cleaning component abuts against the connection between the blade and the elastic connection part. When in the self-cleaning state, the blade moves away from the center of the impeller, and the angle θ between the contact point of the inner edge of the blade and the cleaning component along the tangent direction of the inner edge of the blade and the perpendicular line to the central axis of the impeller rotation direction is greater than 90°. At this time, the cleaning component moves along the extension direction of the blade.

[0006] In this design, the blades are connected to the impeller's central disk via an elastic connector. Due to the impeller's rotation, the blades experience centrifugal force. During normal operation, the angle θ between the contact point between the inner edge of the blade and the cleaning component and the perpendicular line from the tangent of the blade's inner edge to the central axis of the impeller's rotation direction is less than 90°. At this time, the cleaning component is supported by the inner edge of the blade towards the central disk and does not move along the blade's extension direction. In the self-cleaning state, the blades experience centrifugal force due to the impeller's rotation and move away from the impeller's center. The angle θ between the contact point between the inner edge of the blade and the cleaning component and the perpendicular line from the tangent of the blade's inner edge to the central axis of the impeller's rotation direction is greater than 90°. At this time, the cleaning component is supported by the inner edge of the blade towards the direction away from the impeller's central disk. Under this supporting force, the cleaning component moves along the blade's extension direction and cleans oil stains from the blades during this movement. With the above configuration, the cleaning components on the blades can reciprocate in the blade extension direction according to the impeller speed and clean the oil stains on the blades. There is no need to add water circuits, circuits, or other components required for heating, water flow, and ultrasonic methods, and no need to add an additional power source. This reduces system complexity, saves costs, and improves system reliability.

[0007] Preferably, the elastic connection portion is provided with initial deformation so that when in the normal working state, the centrifugal torque generated by the blade due to the rotation of the impeller is less than the restoring torque generated by the elastic connection portion due to the initial deformation; and when in the self-cleaning state, the centrifugal torque generated by the blade due to the rotation of the impeller is greater than the restoring torque generated by the elastic connection portion due to the initial deformation.

[0008] In this design, the elastic connection is designed with initial deformation to prevent the blades from moving relative to the central plate during normal operation. The contact angle and area between the blades and the air are fixed to ensure that the range hood can stably and efficiently exhaust fumes during normal operation.

[0009] Preferably, the middle plate is provided with a protrusion to cause the elastic connecting portion to produce the initial deformation.

[0010] In this solution, a protrusion is set in the middle plate, which exerts force on the blades or elastic connecting parts, allowing the elastic connecting parts to have initial deformation. The structure is simple and the cost is low. In addition, the protrusion increases the structural strength of the middle plate and improves the service life of the equipment.

[0011] Preferably, the elastic connecting part is a curved elastic disk, the blade is connected to the side of the curved elastic disk opposite to the middle disk, and one end of the curved elastic disk is connected to the middle disk.

[0012] In this solution, a curved elastic disc is used as the elastic connection part. All blades can be connected to the curved elastic disc and then installed and adjusted as a whole. The installation is simple, the price is low, and the source is easy to obtain, thereby reducing costs.

[0013] Preferably, the curved elastic disk has a separation groove formed in the radial direction.

[0014] In this scheme, by opening separation grooves in the radial direction on the curved elastic disk, it is beneficial for the curved elastic disk to deform and reduce the mutual attraction between the curved elastic disks.

[0015] Preferably, there are multiple separation tanks and multiple blades, with the blades connected between two adjacent separation tanks, and each blade is provided with a cleaning component.

[0016] In this scheme, multiple separation grooves are set up, and the blades are connected to the curved elastic disk between two adjacent separation grooves, which facilitates the deformation of the curved elastic disk caused by the blades.

[0017] Preferably, the separation groove is formed radially from the inner edge of the curved elastic disk to the outer edge of the curved elastic disk.

[0018] In this design, when in self-cleaning mode, the blades drive the curved elastic disk to move away from the central disk, and are not obstructed by the presence of the central disk, resulting in a simple structure.

[0019] Preferably, the elastic connecting part is connected to both the front and back sides of the middle plate.

[0020] In this design, by connecting elastic connecting parts to both sides of the central plate and connecting the elastic connecting parts to the blades, a single power source drives twice the number of blades to rotate without changing the blade density, thereby increasing the area acting on the incoming flow and improving the working efficiency of the impeller.

[0021] Preferably, the impeller further includes a limiting member to prevent the cleaning member from moving along the blade extension direction. The limiting member is disposed on the inner edge of the blade away from the end where the blade is connected to the elastic connection portion, and / or, the limiting member is disposed on the outer edge of the blade away from the end where the blade is connected to the elastic connection portion.

[0022] In this solution, limiting elements are provided on the inner and / or outer edges of the blades to prevent the cleaning element from detaching from the blades and failing to clean them, and to prevent the cleaning element from detaching from the blades and flying out, causing danger or damaging the impeller.

[0023] Preferably, the elastic connection includes a spring and a rotating shaft, the inner edge of the bottom edge of the blade is rotatably connected to the inner edge of the middle disk through the rotating shaft, one end of the spring is connected to the blade, and the other end of the spring is connected to the outer edge of the middle disk.

[0024] In this design, the blades are connected to the central disk via a rotating shaft, ensuring a stable connection that is not easily detached. A spring connects the central disk and the blades to provide a force that neutralizes the centrifugal force. This design is inexpensive and structurally stable.

[0025] A fan characterized by including an impeller as described above.

[0026] In this solution, the cleaning components on the blades can reciprocate in the blade extension direction according to the impeller speed and clean the oil stains on the blades. There is no need to add water circuits, circuits, or other components required for heating, water flow, and ultrasonic methods, and no need to add an additional power source. This reduces system complexity, saves costs, and improves system reliability.

[0027] A range hood characterized in that it includes a fan as described above.

[0028] In this solution, the cleaning components on the blades can reciprocate in the blade extension direction according to the impeller speed and clean the oil stains on the blades. There is no need to add water circuits, circuits, or other components required for heating, water flow, and ultrasonic methods, and no need to add an additional power source. This reduces system complexity, saves costs, and improves system reliability.

[0029] A method for cleaning a range hood, characterized in that it uses a range hood as described above, the range hood further including a controller, and the method includes the following steps:

[0030] S1. When the controller receives the power-on signal, it outputs a normal operation signal to the fan, and the fan receives the normal operation signal and enters the normal operation state.

[0031] S2. After time T1, the controller receives the stop working signal and outputs a self-cleaning signal to the fan. The fan receives the self-cleaning signal and enters the self-cleaning state.

[0032] S3. After time T2, the fan speed drops to 0, and the range hood stops working.

[0033] In this solution, with the above settings, each time the range hood receives a shutdown signal, it will output a self-cleaning signal without any additional operation, causing the impeller to enter a self-cleaning state. This prevents oil stains from accumulating on the blades and cleans the oil stains in time. Since a single use will not accumulate too much oil stains, there is no need to design additional discharge components for the cleaned oil stains. Keeping the impeller clean does not require additional facilities, reducing system complexity, saving costs, and improving system reliability.

[0034] Preferably, in step S2, when T1 is less than a preset value t1, the controller does not output a self-cleaning signal.

[0035] In this scheme, when T1 is less than the preset value t1, the controller will not output a self-cleaning signal to avoid energy waste caused by short-term accidental activation of the controller.

[0036] Preferably, in step S1, when the controller receives the power-on signal, it outputs a self-cleaning signal to the fan, and the fan enters the self-cleaning state. After time T2, the fan enters the normal operating state.

[0037] In this solution, a self-cleaning process is added when the range hood is turned on to further ensure timely cleaning of the blades and thus ensure that no oil stains accumulate on the blades.

[0038] The positive and progressive effects of this invention are as follows:

[0039] This invention achieves impeller self-cleaning based on different impeller speeds through a special impeller structure design. It eliminates the need for additional water and electrical components required for heating, water flow, and ultrasonic methods, and also eliminates the need for an additional power source. This reduces system complexity, saves costs, and improves system reliability. Furthermore, it can clean oil stains on the blades in a timely manner without the need for additional self-cleaning control signals, keeping the blades clean and reducing usage complexity, thereby improving the user experience. Attached Figure Description

[0040] Figure 1 This is a perspective view of an impeller according to an embodiment of the present invention.

[0041] Figure 2 This is a partial enlarged view of region A of the impeller according to an embodiment of the present invention.

[0042] Figure 3 This is a front view of an impeller according to an embodiment of the present invention.

[0043] Figure 4 This is a partially enlarged view of region B of the impeller according to an embodiment of the present invention.

[0044] Figure 5 This is a cross-sectional view of an impeller along the CC direction according to an embodiment of the present invention.

[0045] Figure 6 This is a partially enlarged view of region D of the impeller according to an embodiment of the present invention.

[0046] Figure 7 This is a schematic diagram of the normal operating state of an impeller according to an embodiment of the present invention.

[0047] Figure 8 This is a partially enlarged view of region E of the impeller according to an embodiment of the present invention.

[0048] Figure 9 This is a schematic diagram of the self-cleaning state of an impeller according to an embodiment of the present invention.

[0049] Figure 10 This is a partially enlarged view of region E of the impeller according to an embodiment of the present invention.

[0050] Figure 11 This is a schematic diagram of the blade structure according to an embodiment of the present invention.

[0051] Figure 12 This is a schematic flowchart of a range hood cleaning method according to an embodiment of the present invention.

[0052] Explanation of reference numerals in the attached figures:

[0053] 100 leaves

[0054] Limiting component 101

[0055] Curved elastic disc 200

[0056] Separation tank 201

[0057] Cleaning Part 300

[0058] Mid-range 400

[0059] 401 protrusion Detailed Implementation

[0060] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0061] like Figures 1-11 As shown, this embodiment discloses an impeller, which includes an elastic connecting part, blades 100, a cleaning component 300, and a central disk 400. One end of the blades 100 is connected to the elastic connecting part, and the blades 100 extend in the direction of the central axis of the impeller rotation direction. One end of the elastic connecting part is fixed to the central disk 400. The blades 100 move away from the center of the impeller due to the rotation of the impeller, and cause the elastic connecting part to deform. The cleaning component 300 is sleeved on the blades 100 and can reciprocate along the extension direction of the blades 100, and has a normal working state and a self-cleaning state.

[0062] like Figure 7 , Figure 8 As shown, when in normal working condition, the angle θ between the contact point of the inner edge of the blade 100 and the cleaning component 300 along the tangent direction of the inner edge of the blade 100 and the perpendicular line of the central axis of the impeller rotation direction is less than 90°. That is, the intersection of the contact point of the inner edge of the blade 100 and the cleaning component 300 along the tangent direction of the inner edge of the blade 100 and the central axis of the impeller rotation direction is located on the front of the central plate 400. At this time, the cleaning component 300 abuts against the connection between the blade 100 and the elastic connecting part.

[0063] like Figure 7 , Figure 8 As shown, when in normal working condition, the centrifugal torque M0 generated by the impeller rotation of blade 100 is m c ω 2 r, where m c Let r be the mass of each blade 100, r be the distance from the center of gravity of the elastic connection to the center of mass of the blade 100, and ω be the angular velocity of the impeller (ω = 2π*n / 60, where n is the rotational speed of the impeller). The blade 100 is also subjected to the restoring torque of the elastic connection. When the impeller rotational speed is less than the critical speed N, the angle θ between the contact point between the inner edge of the blade 100 and the cleaning component 300 and the perpendicular line from the tangent of the inner edge of the blade 100 to the central axis of the impeller rotation direction is less than 90°, and the cleaning component 300 is subjected to a centrifugal inertial force F. C The supporting force F of blade 100 on cleaning component 300 N The effect of the two, the resultant force F H Pointing towards the center plate at 400 degrees, the cleaning component 300 is in the combined force F. H Under the action of the blade 100, it abuts against the connection between the blade 100 and the elastic connecting part, and does not move along the extension direction of the blade 100.

[0064] like Figure 9 , Figure 10 As shown, when in self-cleaning state, the blade 100 moves away from the impeller center. The angle θ between the contact point of the inner edge of the blade 100 and the cleaning component 300 and the perpendicular line of the tangent of the inner edge of the blade 100 and the central axis of the impeller rotation direction is greater than 90°. That is, the intersection of the contact point of the inner edge of the blade 100 and the cleaning component 300 and the central axis of the impeller rotation direction is located on the back of the central plate 400.

[0065] like Figure 9 , Figure 10 As shown, when in self-cleaning mode, the centrifugal torque M0 generated by the impeller rotation of blade 100 is m c ω 2 As the impeller speed n increases, exceeding the critical speed N, the blade 100 moves outward along the radial direction of the impeller. The angle θ between the tangent of the inner edge of the blade 100 and the perpendicular line to the central axis of the impeller rotation direction at the contact point between the inner edge of the blade 100 and the cleaning component 300 is greater than 90°. The cleaning component 300 is subjected to a centrifugal inertial force F. C The supporting force F of blade 100 on cleaning component 300 N The effect of the two, the resultant force F X Pointing away from the center plate by 400, the cleaning component 300 is at the resultant force F X Under the action of the blade, it moves along the extension direction of the blade 100 and scrapes the surface of the blade 100 to clean the oil stains on the surface of the blade 100.

[0066] like Figure 8As shown, when the impeller speed decreases until it falls below the critical speed, the centrifugal torque generated by the impeller rotation of blade 100 is less than the restoring torque generated by the bending of the curved elastic disk 200, and blade 100 returns to its original position. At this time, the cleaning component 300 generates a driving force F along the tangential direction of blade 100 due to the centrifugal inertial force and the supporting force of blade 100. X Transformed into restoring force F H This allows the cleaning component 300 to gradually return to its normal operating state. The entire process realizes the automatic cleaning and reset strokes of the cleaning component 300, completing one cleaning cycle of the blade 100.

[0067] The critical speed N is the angle θ = 90° between the tangent of the inner edge of the blade 100 and the vertical line of the central axis of the impeller rotation direction when the impeller rotates at a speed N. The critical speed N is related to the slope of the inner edge of the blade 100, the mass of the blade 100, the elastic coefficient of the elastic connection, and the initial connection position between the blade 100 and the elastic connection. In this embodiment, the critical speed N of the impeller is 1500 rpm, and the impeller speed in the self-cleaning state is 2000 rpm. In other embodiments, the impeller speed, critical speed, mass of the blade 100, elastic coefficient of the elastic connection, etc. are selected according to actual needs, and no specific limitation is made here.

[0068] In normal operation, the impeller speed is less than the critical speed N. In self-cleaning mode, the impeller speed is greater than the critical speed N. As the impeller speed increases, the centrifugal force on the blade 100 increases, and the blade 100 moves along the radial direction of the impeller, thereby changing the included angle θ. This changes the direction and magnitude of the supporting force on the cleaning component 300 from the blade 100, and further changes the direction of the resultant force on the cleaning component 300, driving the cleaning component 300 to move along the blade 100, thus realizing the transition between normal operation and self-cleaning mode.

[0069] With the above configuration, the cleaning component 300 on the blade 100 can reciprocate in the extension direction of the blade 100 according to the impeller speed and clean the oil stains on the blade 100. There is no need to add water circuits, circuits and other components required for heating, water flow and ultrasonic methods, and no need to add an additional power source, which reduces the complexity of the system, saves costs and improves the reliability of the system.

[0070] like Figure 6 As shown, in this embodiment, the elastic connecting part is a curved elastic disk 200, and the blade 100 is connected to the side of the curved elastic disk 200 away from the middle disk 400. By using the curved elastic disk 200 as the elastic connecting part, all blades 100 can be connected to the curved elastic disk 200 and then the whole assembly can be installed and adjusted. The installation is simple, the price is low, and the acquisition is easy, thereby reducing costs.

[0071] like Figure 6 As shown, a protrusion 401 is provided on the inner edge of the middle plate 400. The inner side of the curved elastic disk 200 overlaps with the protrusion 401, and the outer side of the curved elastic disk 200 is connected to the middle plate 400, so that the curved elastic disk 200 generates an initial deformation that is concave towards the middle plate 400. The protrusion 401 exerts a force on the curved elastic disk 200, causing the curved elastic disk 200 to have an initial deformation. The structure is simple and inexpensive, and the protrusion 401 increases the structural strength of the middle plate 400, thereby improving the service life of the equipment.

[0072] like Figure 8 As shown, the curved elastic disk 200 is given an initial deformation so that when in normal working condition, the centrifugal torque M0 generated by the impeller rotation of the blade 100 is less than the restoring torque M1 generated by the initial deformation of the curved elastic disk 200. Figure 10 As shown, when in self-cleaning state, the centrifugal torque M0 generated by the impeller rotation of blade 100 is greater than the restoring torque M2 generated by the initial deformation of curved elastic disk 200.

[0073] like Figure 7 , Figure 8 As shown, when in normal working condition, the centrifugal torque generated by the impeller rotation of blade 100 is less than the restoring torque generated by the bending of curved elastic disk 200, i.e., M1 ≥ m c ω 2 r, where M1 is the restoring torque generated by the initial deformation of the curved elastic disk 200, m c Let r be the mass of each blade 100, r be the distance from the center of the curved elastic disk 200 to the center of mass of the blade 100, and ω be the angular velocity of the impeller (ω=2π*n / 60, n is the rotational speed of the impeller). At this time, the blade 100 does not move radially along the impeller, the curved elastic disk 200 does not deform under the action of the blade 100, and the angle θ between the contact point of the inner edge of the blade 100 and the cleaning component 300 and the perpendicular line from the tangent of the inner edge of the blade 100 to the central axis of the impeller rotation direction is less than 90°. At this time, the cleaning component 300 abuts against the connection between the blade 100 and the elastic connecting part.

[0074] like Figure 9 , Figure 10 As shown, when in self-cleaning mode, the centrifugal torque generated by the impeller rotation of blade 100 is greater than the restoring torque generated by the initial deformation of curved elastic disk 200. Blade 100 drives curved elastic disk 200 to deform and move in the radial direction of curved elastic disk 200, i.e., M1 < m c ω 2 r, where M1 is the restoring torque generated by the initial deformation of the curved elastic disk 200, m cLet r be the mass of each blade 100, r be the distance from the center of the curved elastic disk 200 to the center of mass of the blade 100, and ω be the angular velocity of the impeller (ω=2π*n / 60, n is the rotational speed of the impeller). At this time, the blade 100 moves outward along the radial direction of the impeller, causing the curved elastic disk 200 to deform. The angle θ between the contact point between the inner edge of the blade 100 and the cleaning component 300 and the perpendicular line from the tangent of the inner edge of the blade 100 to the central axis of the impeller's rotation direction is greater than 90°. At this time, the cleaning component 300 is subjected to the resultant force F. X Under the action of the blade, it moves along the extension direction of the blade 100 and scrapes the surface of the blade 100 to clean the oil stains on the surface of the blade 100.

[0075] The curved elastic disc 200 is provided with initial deformation, so that the blades 100 do not move relative to the central disc 400 when in normal working condition. The contact angle and area between the blades 100 and the air are fixed to ensure that the range hood can stably and efficiently discharge oil fumes when in normal working condition.

[0076] In other embodiments, the elastic connection further includes a spring and a pivot. The inner edge of the bottom edge of the blade 100 is rotatably connected to the inner edge of the central disk 400 via the pivot. One end of the spring is connected to the blade 100, and the other end is connected to the outer edge of the central disk 400. The inner edge of the central disk 400 has a protrusion 401, which is disposed on the outer edge of the bottom edge of the blade 100 to support the blade 100 and to give the spring initial deformation. The blade 100 is connected to the central disk 400 via the pivot, providing a stable connection that is not easily detached. The spring connects the central disk 400 and the blade 100 to provide a force to neutralize centrifugal force, and is inexpensive and structurally stable. In other embodiments, the elastic connection can be selected as needed, provided it meets the requirements of use.

[0077] like Figure 4 As shown, a separation groove 201 is provided on the curved elastic disk 200 along the radial direction. By providing the separation groove 201 on the curved elastic disk 200 along the radial direction, it is beneficial for the curved elastic disk 200 to deform, thereby reducing the mutual attraction force between the curved elastic disks 200.

[0078] like Figure 4 As shown, there are multiple separation grooves 201 and multiple blades 100. Each blade 100 is connected between two adjacent separation grooves 201, and each blade 100 is equipped with a cleaning component 300. By setting multiple separation grooves 201 and connecting the blades 100 to the curved elastic disk 200 between two adjacent separation grooves 201, the blades 100 can drive the curved elastic disk 200 to deform.

[0079] like Figure 4As shown, the separation groove 201 is grooved radially from the inner edge of the curved elastic disk 200 to the outer edge of the curved elastic disk 200. When in self-cleaning mode, the blade 100 drives the curved elastic disk 200 to move away from the middle disk 400, and is not obstructed by the presence of the middle disk 400, resulting in a simple structure.

[0080] like Figure 1 As shown, curved elastic disks 200 are connected to both sides of the central disk 400. By connecting curved elastic disks 200 to both sides of the central disk 400, and connecting the curved elastic disks 200 to the blades 100, a single power source can drive twice the number of blades 100 to rotate without changing the density of the blades 100, thereby increasing the area acting on the incoming flow and improving the working efficiency of the impeller.

[0081] like Figure 11 As shown, the impeller also includes a limiting member 101 to prevent the cleaning member 300 from moving along the extension direction of the blade 100. In this embodiment, the limiting member 101 is disposed on the inner and outer edges of the end of the blade 100 away from the end connected to the curved elastic disk 200, to prevent the cleaning member 300 from detaching from the blade 100 and failing to clean the blade 100, and to prevent the cleaning member 300 from detaching from the blade 100 and flying out, causing danger or damaging the impeller. In other embodiments, the limiting member 101 may also be disposed separately on the outer or inner edge of the end of the blade 100 away from the end connected to the curved elastic disk 200, depending on the actual situation.

[0082] like Figure 11 As shown, in this embodiment, the curvature of each point on the inner and outer edges of the blade 100 is greater than or equal to the curvature of the contact position between the cleaning component 300 and the blade 100 during normal operation, thereby preventing the cleaning plate from sliding along the extension direction of the blade 100 under the influence of its own gravity.

[0083] like Figure 11 The cleaning component 300 has a through groove, through which the blade 100 passes. The projection shape of the blade 100 on the cleaning component 300 is the same as the shape of the through groove. The edge of the through groove of the cleaning component 300 is attached to the surface of the blade 100 to scrape the oil stains on the surface of the blade 100.

[0084] This embodiment also discloses a fan, which includes the impeller as described above.

[0085] This embodiment also discloses a range hood, which includes the fan described above. The cleaning component 300 provided on the blade 100 can reciprocate in the extension direction of the blade 100 according to the impeller speed and clean the oil stains on the blade 100. There is no need to add water circuits, circuits and other components required for heating, water flow and ultrasonic methods, and no need to add an additional power source, which reduces the complexity of the system, saves costs and improves the reliability of the system.

[0086] like Figure 12 As shown in the figure, this embodiment also discloses a method for cleaning a range hood. The range hood also includes a controller. The method for cleaning the range hood includes the following steps:

[0087] S1. When the controller receives the power-on signal, it outputs a normal operation signal to the fan. The fan receives the normal operation signal, and the impeller rotates at a speed lower than the critical speed N. The range hood enters the normal operation state.

[0088] S2. After time T1, the controller receives the stop signal and outputs a self-cleaning signal to the fan. The fan receives the self-cleaning signal, and the impeller speed increases until it exceeds the critical speed and reaches the preset value. The range hood then enters the self-cleaning state.

[0089] S3. After time T2, the fan speed drops to 0, and the range hood stops working.

[0090] Specifically, each time the range hood receives a shutdown signal, it outputs a self-cleaning signal without additional operation, causing the impeller to enter self-cleaning mode. This prevents grease from accumulating on the blades and cleans the grease promptly. Because a single use does not accumulate excessive grease, there is no need to design additional grease removal components. Maintaining impeller cleanliness requires no additional facilities, reducing system complexity, saving costs, and improving system reliability. T1 is the time the range hood is in normal working condition after being turned on, and T2 is the preset time in self-cleaning mode. In this embodiment, the time T2 for one self-cleaning process of the range hood is 40-50 seconds. The specific value of T2 varies depending on the actual situation and is not specifically limited here.

[0091] In step S2, when T1 is less than a preset value t1, the controller does not output a self-cleaning signal. Setting the controller not to output a self-cleaning signal when T1 is less than the preset value t1 avoids energy waste caused by accidental short-term activation of the controller. In this embodiment, the preset value t1 is 10 seconds. In other embodiments, the preset value t1 is selected according to the actual situation and is not limited here.

[0092] In step S1, when the controller receives the power-on signal, it outputs a self-cleaning signal to the fan, and the fan enters the self-cleaning state. After time T2, the fan enters the normal operating state. An additional self-cleaning process is added when the range hood is turned on to further ensure timely cleaning of the blades 100, thereby ensuring that no oil stains accumulate on the blades 100.

[0093] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0094] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An impeller, characterized in that, The impeller includes a flexible connecting part, blades, a cleaning component, and a central disk. One end of the blade is connected to the elastic connecting part, and the blade extends in the direction of the central axis of the impeller's rotation direction. One end of the elastic connecting part is fixed to the central disk. The blades move away from the center of the impeller due to the rotation of the impeller, causing the elastic connecting part to deform. The cleaning component is fitted onto the blade and can reciprocate along the extension direction of the blade, and has a normal working state and a self-cleaning state. When in the normal working state, the angle θ between the contact point of the inner edge of the blade and the cleaning component along the tangent direction of the inner edge of the blade and the perpendicular line of the central axis of the impeller rotation direction is less than 90°. At this time, the cleaning component abuts against the connection between the blade and the elastic connection part. When in the self-cleaning state, the blade moves away from the center of the impeller, and the angle θ between the contact point of the inner edge of the blade and the cleaning element and the perpendicular line of the central axis of the impeller rotation direction is greater than 90° along the tangent direction of the inner edge of the blade. At this time, the cleaning element moves along the extension direction of the blade.

2. The impeller as described in claim 1, characterized in that, The elastic connection is provided with initial deformation so that when in the normal working state, the centrifugal torque generated by the blade due to the rotation of the impeller is less than the restoring torque generated by the initial deformation of the elastic connection. When in the self-cleaning state, the centrifugal torque generated by the blade due to the rotation of the impeller is greater than the restoring torque generated by the initial deformation of the elastic connection.

3. The impeller as described in claim 2, characterized in that, The central plate is provided with protrusions to cause the elastic connecting part to undergo the initial deformation.

4. The impeller as described in claim 1, characterized in that, The elastic connecting part is a curved elastic disk, the blade is connected to the side of the curved elastic disk opposite to the middle disk, and one end of the curved elastic disk is connected to the middle disk.

5. The impeller as described in claim 4, characterized in that, Separation grooves are formed on the curved elastic disk along the radial direction.

6. The impeller as described in claim 5, characterized in that, The number of separation tanks is multiple, the number of blades is multiple, the blades are connected between two adjacent separation tanks, and each blade is provided with a cleaning component.

7. The impeller as described in claim 5, characterized in that, The separation groove is formed by radially slotting from the inner edge of the curved elastic disk to the outer edge of the curved elastic disk.

8. The impeller as claimed in claim 1, characterized in that, The elastic connecting parts are connected to both sides of the middle plate.

9. The impeller as claimed in claim 1, characterized in that, The impeller also includes a limiting member to prevent the cleaning member from moving along the blade extension direction. The limiting member is located at the inner edge of the blade away from the end where the blade connects to the elastic connection portion. And / or, the limiting member is disposed on the outer edge of the blade at the end away from the end where the blade is connected to the elastic connection portion.

10. The impeller as claimed in claim 1, characterized in that, The elastic connection includes a spring and a rotating shaft. The inner edge of the bottom edge of the blade is rotatably connected to the inner edge of the middle disk through the rotating shaft. One end of the spring is connected to the blade, and the other end of the spring is connected to the outer edge of the middle disk.

11. A fan, characterized in that, The fan includes an impeller as described in any one of claims 1-10.

12. A range hood, characterized in that, The range hood includes the fan as described in claim 11.

13. A method for cleaning a range hood, characterized in that, It uses the range hood as described in claim 12, the range hood further including a controller, and the range hood cleaning method includes the following steps: S1. When the controller receives the power-on signal, it outputs a normal operation signal to the fan, and the fan receives the normal operation signal and enters the normal operation state. S2. After time T1, the controller receives the stop working signal and outputs a self-cleaning signal to the fan. The fan receives the self-cleaning signal and enters the self-cleaning state. S3. After time T2, the fan speed drops to 0, and the range hood stops working.

14. The range hood cleaning method as described in claim 13, characterized in that, In step S2, when T1 is less than the preset value t1, the controller does not output a self-cleaning signal.

15. The range hood cleaning method as described in claim 13, characterized in that, In step S1, when the controller receives the power-on signal, it outputs a self-cleaning signal to the fan, and the fan enters the self-cleaning state. After time T2, the fan enters the normal operating state.

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