Fan blade noise reduction method, fan blade device and air conditioning system

Abstract

The application discloses a fan blade noise reduction method, a fan blade device and an air conditioning system. The fan blade device comprises a fan blade, a power source, a monitoring module and a driving module. The power source is connected with the fan blade and is used for driving the fan blade to rotate. The monitoring module is used for monitoring a set index of the fan blade. The driving module acts on the fan blade. When the set index reaches a set threshold, the driving module drives the fan blade to move towards the power source, so as to enhance the torsional stiffness of a transmission part between the power source and the fan blade. The fan blade device can automatically reduce noise when the axial fan blade produces noise, avoids the situation that the fan blade produces loud noise during operation and affects user rest, and improves user experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of noise reduction, in particular to a fan blade noise reduction method, a fan blade device and an air conditioning system using the fan blade device. BACKGROUND

[0002] Air conditioner is a common household appliance, which is mainly used for adjusting indoor temperature. The air conditioner includes an outdoor unit, which is placed outdoors and used for cooling and heat dissipation of high temperature and high pressure medium generated by the indoor unit. The outdoor unit includes an axial flow fan blade. In the related art, the noise of the axial flow fan blade during use is large, which reduces the user experience. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0004] To this end, the present application provides a fan blade device, which can reduce and remove noise generated by the axial flow fan blade, avoid the situation that the sound of the fan blade during operation is large and affects the user's rest, and improve the user experience.

[0005] The present application also provides a fan blade noise reduction method based on the above fan blade device.

[0006] The present application also provides an air conditioning system using the above fan blade device.

[0007] The fan blade device of the present application comprises:

[0008] a fan blade;

[0009] a power source connected with the fan blade and used for driving the fan blade to rotate;

[0010] a monitoring module for monitoring a set index of the fan blade;

[0011] a driving module acting on the fan blade, the driving module being used for driving the fan blade to move towards the power source to enhance the torsional stiffness of a transmission part between the power source and the fan blade when the set index reaches a set threshold.

[0012] The fan blade device of the present application can reduce and remove noise generated by the axial flow fan blade, avoid the situation that the sound of the fan blade during operation is large and affects the user's rest, and improve the user experience.

[0013] In some embodiments, the driving module comprises:

[0014] a pipe, the power source comprising a driving shaft, the pipe being magnetically conductive and threadedly assembled on the outer circumferential side of the driving shaft, and the fan blade being rotationally assembled on the outer circumferential side of the pipe.

[0015] a coil for driving the pipe to rotate to drive the fan blade to move towards the power source after being energized.

[0016] In some embodiments, the driving module comprises a frame body provided with an assembly hole, part of the pipe is fitted in the assembly hole, and the coil is sleeved on the outer circumferential side of the frame body.

[0017] In some embodiments, the fan blade device comprises a housing, the frame body is connected with the housing, the housing is provided with a ventilation hole for air flow on the outer side of the housing to flow into the housing, and the monitoring module is arranged in the housing.

[0018] In some embodiments, one of the frame body and the driving shaft is provided with a plug-in part, the other is provided with a plug-in slot, the plug-in part is plug-in fitted in the plug-in slot, and the plug-in part can rotate around the axis direction of the driving shaft in the plug-in slot.

[0019] In some embodiments, the fan blade device comprises a rod body, the rod body is arranged in the assembly hole, one end of the rod body is connected with the frame body, one of the plug-in part and the plug-in slot is arranged at the other end of the rod body, and part of the pipe is arranged around the outer circumferential side of the rod body.

[0020] In some embodiments, the torsional stiffness is predicted by the following formula:

[0021] k T = 2πω T 2 ·J T

[0022]

[0023] In the formula: k T is the torsional stiffness of the driving shaft; ω T is the natural frequency of the torsional mode of the driving shaft; J T is the moment of inertia of the driving shaft; M is the mass of the driving shaft; R is the radius of the driving shaft; ρ is the density of the driving shaft; and L is the torsional distance of the driving shaft.

[0024] In some embodiments, the monitoring module comprises a plurality of microphones, the plurality of microphones are arranged opposite to the fan blade, and the plurality of microphones are arranged at intervals along the circumferential direction of the fan blade.

[0025] The fan blade noise reduction method of the embodiments of the present application comprises the following steps:

[0026] monitoring the noise when the fan blade is running;

[0027] If the set index of the monitored noise reaches a first set threshold, the driving module drives the fan blade to move towards the power source until the set index of the noise is less than a second set threshold.

[0028] In some embodiments, the set index comprises at least one of decibel, frequency.

[0029] The air conditioning system of the embodiments of the present application comprises the fan blade device as described in any of the above embodiments.

[0030] In some embodiments, the air conditioning system comprises an outdoor unit, and the fan blade device is arranged in the outdoor unit. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is an exploded schematic view of the fan blade device of the embodiments of the present application.

[0032] Figure 2 is Figure 1 is an assembled schematic view of the driving module in the embodiments of the present application.

[0033] Figure 3 is Figure 2 is a side view schematic view of the driving module in the embodiments of the present application.

[0034] Figure 4 is Figure 2 is a right view schematic view of the driving module in the embodiments of the present application.

[0035] Figure 5 is Figure 4 is a sectional view schematic view of the driving module in the embodiments of the present application.

[0036] Figure 6 is a right view schematic view of the fan blade device of the embodiments of the present application after assembly.

[0037] Figure 7 is Figure 6 is a sectional view schematic view of the driving module in the embodiments of the present application.

[0038] Figure 8 is Figure 7 is a local enlarged schematic view of A in the embodiments of the present application.

[0039] Figure 9 is a flow schematic view of the fan blade noise reduction method of the embodiments of the present application.

[0040] REFERENCE SIGNS:

[0041] fan blade 1;

[0042] power source 2; driving shaft 21; slot 211;

[0043] monitoring module 3;

[0044] Driving module 4; pipe 41; frame 42; assembly hole 421; rod 422; plug-in part 423; coil 43; protruding part 431;

[0045] Housing 5. DETAILED DESCRIPTION

[0046] Embodiments of the present application are described in detail below with reference to examples shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0047] As Figures 1 to 8 shown, the fan blade device of the embodiment of the present application includes a fan blade 1, a power source 2, a monitoring module 3 and a driving module 4.

[0048] As Figure 1 shown, the fan blade 1 can be an axial fan blade, the fan blade 1 includes a plurality of circumferentially spaced blades, when the fan blade 1 rotates, it can blow the airflow on one side to the other side, thereby achieving ventilation and heat dissipation.

[0049] The power source 2 is connected with the fan blade 1 and is used to drive the fan blade 1 to rotate, for example, the power source 2 can be a motor, a hydraulic motor, etc. As Figure 1 shown, the power source 2 can be arranged on the left side of the fan blade 1, the driving shaft 21 of the power source 2 can be connected with the transmission of the fan blade 1, the power source 2 can provide power for the rotation of the fan blade 1, thereby facilitating the driving of the rotation of the fan blade 1.

[0050] The monitoring module 3 can be arranged on the power source 2 or other components, the monitoring module 3 can receive or perceive sound waves, for example, the monitoring module 3 can be a microphone, the monitoring module 3 can monitor the sound loudness (set index) generated by the fan blade 1 when it moves, the monitored information can be transmitted to the processing module, the processing module can be a PLC control system or other common control device or processing device. The processing module can analyze the sound and determine whether the sound loudness exceeds the standard.

[0051] The driving module 4 acts on the fan blade 1, the driving module 4 is used to drive the fan blade 1 to move towards the power source 2 when the set index reaches the set threshold value to enhance the torsional stiffness of the transmission part between the power source 2 and the fan blade 1.

[0052] Specifically, the driving module 4 is a type of driving device such as an electric push rod or a telescopic cylinder, the driving module 4 can be connected with the fan blade 1 and can drive the fan blade 1 to move in the left-right direction, and the fan blade 1 can rotate relative to the driving module 4, thereby meeting the needs of the power source 2 driving the fan blade 1 to rotate. For example, the driving module 4 can be arranged on the right side of the fan blade 1, the position adjustment of the fan blade 1 in the left-right direction can be realized through the telescopic extension of the driving module 4, and the left end of the fan blade 1 and the driving module 4 can be rotatably assembled.

[0053] When the sound loudness monitored by the monitoring module 3 exceeds the set index (i.e., the set index reaches the set threshold), the driving module 4 operates and drives the fan blade 1 to move to the left side (towards the power source 2), so that the distance between the fan blade 1 and the power source 2 becomes smaller. Due to the smaller distance, the torsional stiffness of the transmission part between the power source 2 and the fan blade 1 becomes larger, thereby avoiding the case that the fan blade 1 easily swings up and down when the torsional stiffness is small, and the noise is large, so that the "whirring sound" of the fan blade 1 disappears under the current motor (power source 2) speed condition.

[0054] The fan blade device of the embodiment of the application can automatically reduce and remove noise when the axial fan blade 1 generates noise, thereby avoiding the case that the fan blade 1 generates loud noise during operation and affecting the user's rest, and improving the user experience.

[0055] In some embodiments, the driving module 4 includes a pipe 41 and a coil 43, the power source 2 includes a driving shaft 21, the pipe 41 is magnetically conductive and is threadedly assembled to the outer peripheral side of the driving shaft 21, the fan blade 1 is rotationally assembled to the outer peripheral side of the pipe 41, and the coil 43 is used to drive the pipe 41 to rotate to drive the fan blade 1 to move towards the power source 2 after being electrified.

[0056] As shown in Figures 1 to 5 The pipe 41 can be a circular tube, the pipe 41 can be internally threaded, the driving shaft 21 of the power source 2 can be externally threaded, and the pipe 41 can be sleeved on the outer peripheral side of the driving shaft 21 and threadedly matched with the driving shaft 21. The fan blade 1 can be fixed to the outer peripheral side of the pipe 41, for example, the fan blade 1 can be rotationally assembled to the outer peripheral side of the pipe 41 in a key matching manner, and in other embodiments, the fan blade 1 can be fixed to the outer peripheral side of the pipe 41 in a manner of being pasted, fastened by a fastener or the like. The pipe 41 can be processed by a magnetic conductive material, for example, the material of the pipe 41 can be magnetic steel or the like.

[0057] The coil 43 can be an electromagnetic coil, and the coil 43 can be wrapped around the outer peripheral side of the pipe 41. During use, current can be input into the coil 43, so that the coil 43 can generate a magnetic field, the pipe 41 can generate a torque under the action of the magnetic field and can spiral move to the left side around the driving shaft 21, thereby driving the fan blade 1 to move towards the power source 2.

[0058] The magnetic conduction of the pipe 41 and the design of the coil 43 realize non-contact driving of the pipe 41, that is, when no current is input into the coil 43, the pipe 41 has a high degree of freedom of movement, thereby avoiding the problem that the connection constraint needs to be considered when the pipe 41 is driven to move in the left and right directions by other ways, avoiding the interference with the driving of the power source 2, and being conducive to simplifying the structure and reducing the failure rate.

[0059] It should be noted that in the embodiment, the pipe 41 and the driving shaft 21 can be designed to have the same helical direction, so that the pipe 41 can move synchronously with the driving shaft 21 when the driving shaft 21 rotates to one side. The coil 43 can drive the pipe 41 to rotate along the helical direction of the thread on the driving shaft 21, so as to achieve the helical movement of the pipe 41.

[0060] In some embodiments, the driving module 4 comprises a frame 42, the frame 42 is provided with an assembly hole 421, and part of the pipe 41 is fitted in the assembly hole 421. The coil 43 is sleeved on the outer circumferential side of the frame 42.

[0061] For example, as shown in Figure 1 Only Figure 5 as shown, the frame 42 can be generally tubular, and the inner cavity of the frame 42 forms the assembly hole 421. The right end of the frame 42 can be fixedly installed, i.e., the right end of the frame 42 can be fixed on other components, and the left end of the frame 42 can be in a suspended state.

[0062] When assembled, as shown in Figure 5 , the coil 43 can be fixed on the outer circumferential side of the frame 42, and part of the pipe 41 can be inserted into and clearance-fitted in the assembly hole 421 of the frame 42. The part of the pipe 41 inserted into the assembly hole 421 in the inner-outer direction corresponds to the coil 43, so that the pipe 41 can be ensured to be within the magnetic field generated by the coil 43 when energized, and the installation and fixation of the coil 43 are facilitated.

[0063] Optionally, as shown in Figure 4 , a protruding portion 431 can be provided below the coil 43, and the protruding portion 431 is used to lead out the wire, so as to facilitate the connection of the coil 43 and the power supply.

[0064] In some embodiments, the fan blade device comprises a housing 5, the frame 42 is connected to the housing 5, the housing 5 is provided with ventilation holes for air flow on the outer side of the housing 5 to flow into the housing 5, and the monitoring module 3 is arranged in the housing 5.

[0065] For example, as shown in Figure 1 , Figures 6 to 8 , the housing 5 is in a grid structure, and the housing 5 can be uniformly provided with ventilation holes, so as to meet the use needs of air inlet or air outlet. Part of the housing 5 can be located on the right side of the driving module 4, and the right end of the frame 42 can be fixedly connected to the left side of the housing 5 in a manner of welding, bonding, fastener connection, etc. The monitoring module 3 can be fixed on the housing 5, and in the left-right direction, the monitoring module 3 is opposite to the fan blade 1, so as to ensure the accuracy of monitoring.

[0066] In some embodiments, one of the frame body 42 and the drive shaft 21 is provided with a plug-in part 423, and the other is provided with a slot 211, the plug-in part 423 is plug-in matched in the slot 211, and the plug-in part 423 can rotate around the axis direction of the drive shaft 21 in the slot 211.

[0067] For example, as shown in Figure 5 The plug-in part 423 can be provided on the frame body 42, and the slot 211 can be provided on the right end of the drive shaft 21. When assembled, the plug-in part 423 can be plug-in matched in the slot 211, so as to realize the connection of the frame body 42 and the drive shaft 21. The free end of the drive shaft 21 and the free end of the frame body 42 can be overlapped, and mutual limiting in the vertical plane can be realized, avoiding the situation that the drive shaft 21 and the frame body 42 are easily swung up and down and tilted when suspended, improving the stability of the structure, and being also beneficial to further noise reduction.

[0068] It should be noted that the plug-in part 423 can be generally conical, and the slot 211 can be a conical slot. When the plug-in part 423 is inserted into the slot 211, the plug-in part 423 can freely rotate in the slot 211, so as to avoid the interference caused by the driving of the power source 2.

[0069] It can be understood that in other embodiments, the slot 211 can also be provided on the frame body 42, and the plug-in part 423 can also be provided on the drive shaft 21.

[0070] In some embodiments, the fan blade device includes a rod body 422, the rod body 422 is arranged in the assembly hole 421, one end of the rod body 422 is connected with the frame body 42, one of the plug-in part 423 and the slot 211 is arranged at the other end of the rod body 422, and part of the pipe 41 is arranged around the outer periphery of the rod body 422.

[0071] As shown in Figure 5 and Figure 8 The rod body 422 can be integrally formed with the frame body 42, the rod body 422 can be arranged in the assembly hole 421 of the frame body 42, and the rod body 422 can extend along the central axis of the frame body 42. For example, the right end of the rod body 422 can be connected with the frame body 42, the left end of the rod body 422 can be arranged outside the left hole of the assembly hole 421, and the plug-in part 423 can be integrally formed at the left end of the rod body 422. As shown in Figure 8 the right end of the pipe 41 can be arranged in the assembly hole 421 and around the outer periphery of the rod body 422.

[0072] In this way, the slot 211 and the plug-in part 423 can be hidden in the pipe 41, avoiding the situation that impurities easily enter between the two when exposed, and achieving the sealing protection effect.

[0073] It is understood that in some other embodiments, the frame 42 may also be a tubular structure, and the rod 422 may be connected and fixed to the housing 5. For example, the right end of the rod 422 may extend from the right side opening of the mounting hole 421 of the frame 42 and be connected to the housing 5.

[0074] In some embodiments, the torsional stiffness of the drive shaft 21 can be predicted by the following formula:

[0075] k T =2πω T 2 ·J T

[0076]

[0077] In the formula: k T For the torsional stiffness of drive shaft 21; ω T J is the natural frequency of the torsional mode of the drive shaft 21; T Let ρ be the moment of inertia of drive shaft 21; M be the mass of drive shaft 21; R be the radius of drive shaft 21; ρ be the density of drive shaft 21; and L be the torsional distance of drive shaft 21.

[0078] In some embodiments, the monitoring module 3 includes a plurality of microphones, which are arranged opposite to the fan blade 1 and spaced apart circumferentially along the fan blade 1. Figure 1 As shown, four microphones can be provided. In other embodiments, three, five, six, or other numbers of microphones can also be provided. Multiple microphones can be fixed to the left side of the housing 5, and can be arranged at equal intervals around the central axis of the fan blade 1. The arrangement of multiple microphones allows for monitoring of sound waves from different directions and also helps to eliminate errors and improve monitoring accuracy.

[0079] The following describes a noise reduction method for wind turbine blade 1 according to an embodiment of the present invention.

[0080] The noise reduction method for wind turbine blade 1 according to this embodiment of the invention includes the following steps:

[0081] S1: Monitors the noise level of fan blade 1 during operation. Specifically, such as... Figure 9 As shown, when the power source 2 drives the fan blade 1 to rotate, multiple microphones can be used to monitor the frequency domain characteristics of the sound waves emitted by the fan blade 1 during operation.

[0082] S2: If the noise setting index reaches the first setting threshold, drive the fan blade 1 to move towards the power source 2 until the noise setting index is less than the second setting threshold.

[0083] Specifically, the set index can be the loudness of the sound, that is, the fan blade 1 will produce a "whirring" noise when it is running, and the decibel of the noise will usually exceed the specified decibel value (the first set threshold value). At this time, the driving module 4 will start, that is, the coil 43 will be supplied with current and generate a magnetic field. Under the action of the magnetic field, the pipe 41 will move spirally to the left relative to the driving shaft 21, thereby playing a role in tightening the pipe 41 and the fan blade 1, and driving the fan blade 1 to move to the left, thereby shortening the distance between the fan blade 1 and the power source 2 and improving the torsional stiffness of the transmission part between the power source 2 and the fan blade 1.

[0084] With the leftward movement of the fan blade 1, the "whirring" sound of the fan blade 1 at the current speed will disappear (the set index is less than the second set threshold value), thereby achieving the effect of eliminating noise. It should be noted that the fan blade 1 will produce a "whirring" sound at different speeds, and moving the fan blade 1 to the left can shift the "whirring" sound of the fan blade 1 to other speed conditions and make it disappear under the current motor speed condition. That is, the method of the embodiment of the present application can be adaptively adjusted for different speeds, realizing phased closed-loop control and improving user experience.

[0085] It can be understood that the first set threshold value and the second set threshold value can be the same or different. In use, the user can selectively determine the first set threshold value or the second set threshold value according to his own situation or noise tolerance.

[0086] Optionally, in some other embodiments, the monitoring module 3 can also monitor the frequency of the sound wave.

[0087] The air conditioning system of the embodiment of the present application is described below.

[0088] The air conditioning system of the embodiment of the present application comprises an outdoor unit, and a fan blade device is installed in the outdoor unit. By arranging the fan blade device of the embodiment of the present application, the air conditioning system can realize self-noise reduction and noise elimination when it is running, thereby avoiding noise pollution and improving user experience.

[0089] It can be understood that the fan blade device of the embodiment of the present application can also be applied to fans, range hoods and other devices or systems that need to use the fan blade device, thereby achieving the effect of noise reduction.

[0090] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0091] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0092] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0093] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0094] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terms "comprising", "containing", "having" or "including" and their derivatives, mean "including but not limited to". The terms "coupled" and "connected", along with their derivatives, mean "directly or indirectly connected".

[0095] Although the above-mentioned embodiments have been shown and described, it is to be understood that the above-mentioned embodiments are exemplary, and are not to be construed as limiting the present disclosure, and any change, modification, replacement, and variation made by those skilled in the art to the above-mentioned embodiments are within the protection scope of the present disclosure.

Claims

1. A fan blade device, characterized in that, The fan blade; The power source, which is connected with the fan blade and used to drive the fan blade to rotate; The monitoring module, which is used to monitor the set index of the fan blade; The driving module, which acts on the fan blade, and is used to drive the fan blade to move towards the power source to enhance the torsional stiffness of the transmission part between the power source and the fan blade when the set index reaches the set threshold value; The power source includes a driving shaft, a pipe is assembled on the outer circumferential side of the driving shaft, and the fan blade is rotationally assembled on the outer circumferential side of the pipe; The pipe rotates to drive the fan blade to move towards the power source. The driving module includes:

2. The blade device of claim 1, wherein, The pipe, which is magnetically conductive and is threadedly assembled on the outer circumferential side of the driving shaft; The coil, which is used to drive the pipe to rotate after being energized. The driving module includes a frame body, the frame body is provided with an assembly hole, part of the pipe is fitted in the assembly hole, and the coil is sleeved on the outer circumferential side of the frame body.

3. The blade device of claim 2, wherein, The frame body is connected with a shell, the shell is provided with a ventilation hole for air flow on the outer side of the shell to flow into the shell, and the monitoring module is arranged in the shell.

4. The blade device of claim 3, wherein, One of the frame body and the driving shaft is provided with a plug-in part, the other is provided with a plug-in groove, the plug-in part is plug-in fitted in the plug-in groove, and the plug-in part can rotate around the axis direction of the driving shaft in the plug-in groove.

5. The blade device of claim 3, wherein, The rod body is arranged in the assembly hole, one end of the rod body is connected with the frame body, one of the plug-in part and the plug-in groove is arranged at the other end of the rod body, and part of the pipe is arranged around the outer circumferential side of the rod body.

6. The blade device of claim 5, wherein, The torsional stiffness is predicted by the following formula:

7. The blade device of claim 2, wherein, The monitoring module includes a plurality of microphones, the plurality of microphones are arranged opposite to the fan blade, and the plurality of microphones are arranged at intervals along the circumferential direction of the fan blade. k T = 2πω T 2 ·J T where: k T is the drive shaft torsional stiffness; ω T is the drive shaft torsional mode natural frequency; J T is the drive shaft moment of inertia; M is the mass of the drive shaft; R is the radius of the drive shaft; p is the density of the drive shaft; and L is the torsional distance of the drive shaft.

8. The blade device according to any one of claims 1-7, characterized in that, The method includes the following steps:

9. A fan blade noise reduction method based on the fan blade device according to any one of claims 1-8, characterized in that, Monitoring the noise of the fan blade during operation; If the set index of the monitored noise reaches the first set threshold value, the fan blade is driven to move towards the power source until the set index of the noise is less than the second set threshold value. The set index includes at least one of decibel and frequency.

10. The fan blade noise reduction method of claim 9, wherein, The fan blade device includes any one of claims 1-8.

11. An air conditioning system, characterised in that, The fan blade device is arranged in an outdoor unit.

12. The air conditioning system of claim 11, wherein, The fan blade device is arranged in an outdoor unit.

Images