Fan and fan dust deposition detection method

Abstract

The embodiment of the invention provides a fan and a fan dust deposition detection method. The fan comprises a base, fan blades, a light emitter, a light receiver and a controller. The base is provided with a rotating shaft. The fan blade comprises a mounting part and a plurality of blades connected to the mounting part, and the mounting part is mounted on the rotating shaft. The light emitter is used for emitting detection light, and the light path of the detection light intersects with the rotation path of the multiple paddles. The light receiver is used for receiving the detection light. And the controller is electrically connected with the light receiver and the light emitter and is used for determining the ash deposition state of the paddle according to the detection light received by the light receiver. The light emitter is used for emitting detection light to the rotating path of the blade, the light receiver is used for receiving the detection light, and finally the controller is used for determining the dust deposition degree of the blade according to the detection light received by the light receiver. The fan provided by the embodiment of the invention is high in detection precision, and the dust deposition degree of the blades can be detected more timely.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of household appliances, and in particular, to a fan and a method for detecting dust accumulation in the fan. Background Art

[0002] In recent years, as the summer temperature gradually rises, fans have become an indispensable heat dissipation device for people. In some places where air conditioners are not installed, fans are particularly important. However, when the fan is running, the blades will rub against the air to generate static electricity, which will absorb dust in the air. After a period of time, thick dust will accumulate on the fan blades, making it look dirty. After the dust falls, it will be blown away by the fan, which brings a bad experience to users.

[0003] Currently, there is no good technology for detecting dust accumulation on fan blades. Users can only judge the degree of dust accumulation on the fan by their own eyes and then clean the fan. This judgment method has low accuracy, and usually it is too late when users see the dust accumulation with their naked eyes. Summary of the invention

[0004] The embodiment of the present application provides a fan to solve the problem that currently users can only judge the dust accumulation degree of the fan by naked eyes and then clean the fan, resulting in low judgment accuracy and untimely judgment.

[0005] In a first aspect, an embodiment of the present application provides a fan, comprising: a fan blade, a light emitter, a light receiver, and a controller. The fan blade comprises a mounting portion and a plurality of blades connected to the mounting portion, and the mounting portion is mounted on the rotating shaft. The light emitter is used to emit a detection light, and the light path of the detection light intersects with the rotation path of the plurality of blades. The light receiver is used to receive the detection light. The controller is electrically connected to the light receiver and the light emitter, and is used to determine the dust accumulation state of the blade according to the detection light received by the light receiver.

[0006] In one embodiment, the fan further includes: a base, the base is equipped with a rotating shaft, the mounting portion is mounted on the rotating shaft, and the light transmitter and the light receiver are located on the same side of the fan blade.

[0007] In one embodiment, the angle between the optical axis direction of the detection light and the axial direction of the rotating shaft is 30°-45°.

[0008] In one embodiment, the optical receiver has a receiving hole, and the angle between the axis direction of the receiving hole and the optical axis direction of the detection light is 30°-45°.

[0009] In one embodiment, the fan further includes a collecting lens, which is disposed in the receiving hole and is used to converge the detection light entering the receiving hole.

[0010] In one embodiment, the paddle includes a first area connected to the mounting portion and a second area opposite to the first area, and the optical path of the detection light intersects with the rotation path of the second area of ​​the paddle.

[0011] In one embodiment, the wavelength of the detection light emitted by the light emitter is 0.76-1000 microns.

[0012] In one embodiment, the fan also includes a drive motor, which is transmission-connected to the rotating shaft to drive the rotating shaft to rotate. The controller is also electrically connected to the drive motor. When receiving a shutdown command, the controller is configured to control the drive motor so that at least one of the multiple blades is located in the optical path of the detection light. The controller is also configured to control the light emitter to emit the detection light and control the light receiver to receive the detection light when the blade is located in the optical path of the detection light, and determine the dust accumulation status of the blade based on the signal strength of the received detection light.

[0013] In one embodiment, the controller is further configured to issue a prompt message when dust accumulates on the blade.

[0014] In a second aspect, an embodiment of the present application provides a fan dust accumulation detection method, wherein the fan comprises a light emitter and a light receiver, wherein the light emitter is used to emit a detection light, wherein the light path of the detection light intersects with the rotation path of the blades of the fan; and the light receiver is used to receive the detection light, wherein the method comprises:

[0015] Controlling the light emitter to emit detection light;

[0016] Controlling the optical receiver to receive detection light;

[0017] According to the signal intensity of the received detection light, it is determined that dust is accumulated on the blade.

[0018] In one embodiment, if the ratio of the signal intensity of the received detection light to the signal intensity of the emitted detection light is greater than or equal to a preset threshold, it is determined that dust accumulation exists on the blade.

[0019] In one implementation, if the signal intensity of the received detection light is greater than or equal to a preset threshold, it is determined that dust accumulation exists on the blade.

[0020] In one embodiment, the method further comprises:

[0021] When it is determined that dust is accumulated on the blade, a prompt message is output.

[0022] In one embodiment, the fan further comprises: an automatic cleaning device, and the method further comprises:

[0023] When it is determined that dust is accumulated on the blade, a prompt message is output, and the automatic cleaning device is controlled to start to clean the blade.

[0024] The fan and fan dust accumulation detection method provided in the embodiment of the present application are provided with a light transmitter, a light receiver and a controller in the fan, the light transmitter is used to emit detection light on the rotation path of the blade, and the light receiver is used to receive the detection light. Finally, the controller determines the dust accumulation degree of the blade according to the detection light received by the light receiver. Since the detection light is irradiated on a smooth blade and on a dusty blade, the scattering direction of the detection light will be different, which will cause the signal strength of the detection light received by the light receiver to be different. Finally, whether the blade is dusty can be determined according to the signal strength of the detection light received by the light receiver. The fan detection provided in the embodiment of the present application has high detection accuracy and can detect the dust accumulation degree of the blade more timely, which solves the problem in the prior art that the user can only judge the dust accumulation degree of the fan by the naked eye and then clean the fan, resulting in low judgment accuracy and untimely judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic structural diagram of a fan provided in an embodiment of the present application is shown.

[0027] Figure 2 A schematic structural diagram of an optical transmitter, an optical receiver, a controller and a protective shell provided in one embodiment of the present application is shown.

[0028] Figure 3 A schematic diagram of dust accumulation detection provided in an embodiment of the present application is shown.

[0029] Figure 4 A flow chart of a fan dust accumulation detection method provided by an embodiment of the present application is shown.

[0030] Figure 5 A specific flow chart of a fan dust accumulation detection method provided by an embodiment of the present application is shown.

[0031] Figure 6 Another specific flow chart of a fan dust accumulation detection method provided by an embodiment of the present application is shown.

[0032] Figure 7 Another specific flow chart of a fan dust accumulation detection method provided by an embodiment of the present application is shown.

[0033] Figure 8 Another specific flow chart of a fan dust accumulation detection method provided by an embodiment of the present application is shown.

[0034] Figure numerals: fan 1, base 10, rotating shaft 110, fan blade 20, mounting portion 210, blade 220, first area 221, second area 222, first surface 223, second surface 224, light emitter 30, light receiver 40, receiving hole 410, controller 50, collecting lens 60, housing 70, dust 80, protective shell 90. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0036] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0037] In recent years, as the summer temperature gradually rises, fans have become an indispensable heat dissipation device for people. In some places where air conditioners are not installed, fans are particularly important. However, when the fan is running, the blades will rub against the air to generate static electricity, which will absorb dust in the air. After a period of time, thick dust will accumulate on the fan blades, making it look dirty. After the dust falls, it will be blown away by the fan, which brings a bad experience to users.

[0038] Currently, there is no good technology for detecting dust accumulation on fan blades. Users can only judge the degree of dust accumulation on the fan by their own eyes and then clean the fan. This judgment method has low accuracy, and usually it is too late when users see the dust accumulation with their naked eyes.

[0039] Based on the above problems, the embodiments of the present application provide a fan to solve the problem that when the fan is dusty, the user can only judge the degree of dust accumulation by naked eyes. It should be noted that the fan provided in the embodiments of the present application can be a ceiling fan, a table fan, a floor fan, a wall fan, a top fan, a ventilation fan, a rotary fan or an air conditioning fan, etc., and is not limited here.

[0040] See also Figure 1 , Figure 1 The structure diagram of a fan 1 provided in an embodiment of the present application is shown. This embodiment is described in detail by taking the fan 1 as a floor fan as an example. In this embodiment, the fan 1 may include: a base 10, fan blades 20, a light transmitter 30, a light receiver 40 and a controller 50.

[0041] In the embodiment of the present application, the fan 1 may further include a shell 70, which may be a mesh structure and is arranged around the fan blades 20. The shell 70 may wrap the fan blades 20 within the internal space of the shell 70. The shell 70 may be used to protect the user and prevent the user from being accidentally touched and injured by the fan blades 20 when the fan blades 20 rotate, thereby improving the safety of the fan 1.

[0042] The housing 70 can be made of metal or plastic. The housing 70 made of metal is durable and has good heat dissipation performance, which can effectively reduce the temperature of the fan and extend its service life. In addition, the surface of the metal material itself is smooth and easy to clean, and it is not easy to leave dust or stains. The advantage of the housing made of plastic is that it is light, easy to carry and use, and it also has a cost advantage over metal. Plastic materials are usually lighter than metal materials and will not bump or scratch other objects.

[0043] It is understandable that the embodiment of the present application does not limit the specific structure of the housing 70, and the user can make a selection based on the actual usage scenario.

[0044] The base 10 can be made of materials such as plastic, metal or wood. Plastic is currently the main material for making the base 10 of the fan 1. It has the advantages of light weight, low price and durability. Materials such as aluminum alloy or stainless steel are also used to make the base 10 of the fan 1. This material has the advantages of being strong and stable, but it is relatively heavy. The base 10 of a few fans 1 is also made of wood. Due to the high density of wood, the electric fan base has good stability after being made, and also has the advantage of being natural and beautiful.

[0045] It is understandable that the base 10 made of different materials has its own advantages and applicable scenarios. For example, the plastic base is light and easy to carry and suitable for use at home or office, and the metal base is stable and anti-swaying, suitable for large electric fans. The wooden base is mostly used for antique electric fans. The embodiment of the present application does not limit the specific structure of the base 10, and the user can choose according to the actual situation.

[0046] A rotating shaft 110 may be installed on the base 10. The rotating shaft 110 may generally be made of steel or aluminum. These materials have the advantages of high strength, wear resistance, and corrosion resistance, which help to improve the service life of the rotating shaft 110. Among them, the aluminum material also has the characteristics of light weight and good thermal conductivity. Therefore, an aluminum rotating shaft 110 may be used in some fans 1 with higher requirements to further improve the efficiency and service life of the fan 1. In addition, in some other embodiments, the rotating shaft 110 may also be made of ceramic material. Since ceramics have the advantages of high mechanical strength, high hardness, and corrosion resistance, the life of the fan 1 can be effectively extended. However, due to the high difficulty in manufacturing ceramic materials, the fan 1 using a ceramic rotating shaft 110 is usually more expensive. It should be noted that the embodiment of the present application does not limit the specific structure of the rotating shaft 110, and users can choose according to actual needs.

[0047] See also Figure 2 , Figure 2 A schematic diagram of the structure of the light transmitter 30, the light receiver 40, the controller 50 and the protective shell 90 provided in one embodiment of the present application is shown. The fan blade 20 may include a mounting portion 210 and a plurality of blades 220 connected to the mounting portion 210, and the mounting portion 210 is mounted on the rotating shaft 110. It should be noted that the embodiment of the present application does not limit the specific number of blades 220, for example, it can be 6 blades as shown in the figure, or it can be 8 blades, etc. The mounting portion 210 can be bonded, clamped, or falcon-connected to the base 10, which is not limited here. In some embodiments, the mounting portion 210 and the base 10 can also be welded or integrally formed to improve the strength and stability of the structure.

[0048] In this embodiment, the blades 220 can be made of plastic, metal or wood. The blades 220 made of plastic have the advantages of being light, cheap and easy to process, but they have low strength and are easily damaged. The blades 220 made of metal have high strength and good durability, so not only the fan 1 has low noise, but also high reliability and strong wind force. However, the blades 220 made of metal are usually more expensive. The blades 220 made of wood are also often used to decorate the fan 1, which has the advantages of being beautiful and environmentally friendly. However, wood is mainly a natural material with relatively low strength, and is easily affected by moisture, and requires regular cleaning and maintenance.

[0049] The user can select blades 220 of different materials according to different use occasions and needs. For example, metal blades 220 are suitable for occasions that require long-term work or frequent use. Wood materials are suitable for some occasions that emphasize environmental protection and fashion, and wood maintenance is required when it is not used frequently.

[0050] The rotating shaft 110 can drive the blades 220 to rotate, thereby generating air flow. Specifically, the blades 220 suck in air when rotating, and then generate airflow to discharge, forming a gust of wind. Through continuous circulation, a blowing effect is formed. In this embodiment, the width of the blades 220 gradually increases from one end close to the rotating shaft 110 to the end away from the rotating shaft 110 to increase the air volume.

[0051] See also Figure 3 , Figure 3 The schematic diagram of dust accumulation detection provided by an embodiment of the present application is shown. The light emitter 30 is used to emit detection light, and the light path of the detection light intersects with the rotation path of the multiple blades 220. That is, when the blades 220 rotate, the detection light emitted by the light emitter 30 can be intermittently irradiated on the blades 220. When the blades 220 stop rotating, the blades 220 can be located in the light path of the detection light, and the detection light can be irradiated on the blades 220 to detect the degree of dust accumulation on the blades 220.

[0052] It should be noted that the embodiments of the present application do not limit the specific detection method. For example, in one embodiment, the light emitter 30 and the light receiver 40 can be respectively arranged on both sides of the blade 220. At this time, it can be judged whether the blade 220 is dusty based on the waveform information received by the light receiver 40 after the detection light is irradiated on the blade 220 in a timed sequence. Specifically, when the detection light passes through the smooth blade 220, the time is slowed down to the millisecond level. At this time, the light intensity in the waveform of the detection light received by the light receiver 40 will increase linearly. When the detection light is irradiated to the dusty blade 220, since the dust on the edge of the blade 220 is not a completely opaque entity, but an uneven substance that is translucent in some places and opaque in others, the light intensity in the waveform of the detection light received by the light receiver 40 is also unstable, and the light intensity received by the light receiver 40 does not increase linearly, thereby judging whether the blade 220 is dusty.

[0053] For example, in some other embodiments, the blade 220 may be configured as a light-transmitting structure, and in this case, it may be determined whether the blade 220 is dusty based on the light intensity information received by the light receiver 40 after the detection light passes through the blade 220. Specifically, since the detection light is irradiated on a smooth blade 220 and on a dusty blade 220, the light intensity of the detection light after passing through the blade 220 is different, which will result in different light intensities of the detection light received by the light receiver 40. Finally, it may be determined whether the blade 220 is dusty based on the light intensity of the detection light received by the light receiver 40.

[0054] For another example, in this embodiment, the light emitter 30 and the light receiver 40 can be arranged on the same side of the blade 220. Since the detection light is irradiated on the smooth blade 220 and on the dusty blade 220, the scattering direction of the detection light will be different, which will cause the signal strength of the detection light received by the light receiver 40 to be different. Finally, whether the blade 220 is dusty can be determined based on the signal strength of the detection light received by the light receiver 40.

[0055] For details, please refer to Figure 2 , the blade 220 may include a first area 221 connected to the mounting portion 210 and a second area 222 opposite to the first area 221, and the optical path of the detection light intersects with the rotation path of the second area 222 of the blade 220. In this embodiment, the second area 222 may occupy 1 / 5-1 / 3 of the blade 220, for example, the second area 222 may occupy 1 / 4 of the blade, etc., and no limitation is made here. Considering that the dust accumulation degree of the second area 220 is usually higher than the dust accumulation degree of the first area 210, the dust accumulation degree of the second area 220 detected by the detection light can more intuitively reflect the dust accumulation degree of the blade 220, so that the user can clean the blade 220 in time. It should be noted that the embodiment of the present application does not limit the specific path of the detection light. In some other embodiments, the detection light emitted by the light emitter 30 may also be irradiated between the first area 221 and the second area 222 of the blade 220.

[0056] Specifically, the light emitted by the light emitter 30 may be infrared light, that is, the wavelength of the detection light emitted by the light emitter 30 is 0.76-1000 microns (μm). Since infrared light is an electromagnetic wave in the infrared band between visible light and microwaves and with a wavelength range of 0.76-1000 microns. It is invisible light with a lower frequency than red light, so the use of infrared light can avoid the detection light emitted by the light emitter 30 from causing light pollution to the user, which can improve the comfort of the user. It is understandable that in some other embodiments, visible light of other wavelength ranges may also be used, such as lasers with more concentrated energy and a safety level that does not harm the human eye, etc., which are not limited here. In addition, in other embodiments, the light emitted by the light emitter 30 may also be pulsed light, which has high energy density, good aggregation, and high safety. When the fan 1 is in the detection state, the user can identify the mode of the fan 1 by seeing the light.

[0057] The light receiver 40 is used to receive the detection light scattered by the blade 220. In this embodiment, the light receiver 40 and the light emitter 30 may be located on the same side. Specifically, the blade 220 may include a first surface 223 and a second surface 224 that are disposed opposite to each other. The light receiver 40 may be disposed on the housing 70 near the first surface 223, and the light emitter 30 may also be disposed on the housing 70 near the first surface 223.

[0058] In this embodiment, the light emitter 30 can be a light emitting diode (LED), a laser diode (LD), a semiconductor laser, etc. LED has low power consumption and low failure rate, but low luminous efficiency and poor beam quality. LD has high luminous efficiency, good beam quality, and high transmission power, but is expensive. Semiconductor lasers have high stability and strong anti-interference performance.

[0059] The optical receiver 40 can be a photodiode (PD), a PIN photodiode (PIN PhotoDiode), an avalanche photodiode (APD), etc. PD has a fast response speed, a high signal-to-noise ratio, and is not affected by temperature, but has low sensitivity and requires an amplifier to amplify the signal. PIN Photo Diode has an extremely fast response speed, low noise, but low sensitivity and a high price. APD has high sensitivity and can work at lower optical power, but discharge will cause noise, requiring an external amplifier or preamplifier.

[0060] The embodiment of the present application does not limit the specific structure of the optical transmitter 30 and the optical receiver 40, and the user can select a suitable optical transmitter 30 and optical receiver 40 according to actual conditions.

[0061] Please refer again Figure 3 The dots in the figure may represent dust 80. In one embodiment, the optical receiver 40 may also have a receiving hole 410. The receiving hole 410 may be used to receive the detection light emitted by the optical transmitter 30, and at the same time, it may prevent external light from entering the optical receiver 40 and causing interference to the optical receiver 40. The setting of the receiving hole 410 helps to improve the detection accuracy.

[0062] It should be noted that the embodiment of the present application does not impose specific restrictions on the shape and aperture size of the receiving hole 410, but the aperture size of the receiving hole 410 should not be too large or too small. If the aperture of the receiving hole 410 is too small, the optical receiver 40 may not be able to receive the detection light emitted by the optical transmitter 30. If the aperture of the receiving hole 410 is too large, the optical receiver 40 may be disturbed by the external environment, thereby reducing the detection accuracy. Therefore, the size of the receiving hole 410 can be set to between 0.5-1 mm, such as 0.8 mm.

[0063] Furthermore, the fan 1 may also include a collecting lens 60 , which is disposed in the receiving hole 410 and is used to converge the detection light entering the receiving hole 410 . The setting of the collecting lens 60 can improve the detection accuracy of the optical receiver 40 .

[0064] The controller 50 is electrically connected to the light receiver 40 and the light transmitter 30, and is used to determine the dust accumulation state of the blade 220 according to the detection light received by the light receiver 40. In this embodiment, the controller 50 can be a logic controller, a programmable logic controller (PLC) controller, a microprocessor controller, a servo controller or a fuzzy controller. The logic controller is a digital circuit, which is mainly used to implement basic control logic. This controller has a fast response speed, high reliability and low cost. The PLC controller is a dedicated programmable logic controller, which has high reliability and low cost. The microprocessor controller uses a single-chip microcomputer as the core, and can implement complex control algorithms. This controller has high flexibility, good reliability and low cost. The servo controller is mainly used for precise position control and speed control, and can achieve high-speed and high-precision motion control. This controller has a fast response speed, high precision and good stability. The fuzzy controller uses fuzzy logic for control, and can control complex nonlinear systems. This controller has strong adaptability, good robustness and high reliability. It can be understood that the embodiment of the present application does not limit the specific structure of the controller 50, and the user can choose according to the actual situation.

[0065] In this embodiment, the optical transmitter 30, the optical receiver 40 and the controller 50 may be an integrated structure. Specifically, the fan 1 provided in the embodiment of the present application may further include a protective shell 90. The optical transmitter 30, the optical receiver 40 and the controller 50 may all be disposed in the protective shell 90. Integrating the above three components in a protective shell 90 may reduce the overall volume occupied by the optical transmitter 30, the optical receiver 40 and the controller 50. It is understandable that in some other embodiments, the optical transmitter 30, the optical receiver 40 and the controller 50 may also be disposed separately, which is not limited here. The embodiment of the present application will be described in detail later by taking the optical transmitter 30, the optical receiver 40 and the controller 50 as an integrated structure as an example.

[0066] Specifically, based on the principle of light scattering, it can be understood that light scattering refers to the phenomenon that a portion of light deviates from the original propagation direction when light passes through an inhomogeneous medium.

[0067] When the detection light emitted by the light emitter 30 is irradiated on the smooth blade 220, the light is mainly reflected on the blade 220, and the light does not enter the light receiver 40. At this time, the signal strength of the light receiver 40 is P. It can be understood that the reflection of light refers to the phenomenon that when light propagates to different substances, it changes its propagation direction at the interface and returns to the original substance.

[0068] When the blades 220 of the fan 1 are covered with dust, when the detection light emitted by the light emitter 30 is irradiated on the dusty blades 220, the light will be scattered on the blades 220, and part of the detection light will be irradiated on the dust 80. Since the geometric structure of the dust 80 is granular, the detection light will be scattered in all directions in space when irradiated on the dust 80. The propagation direction of the scattered detection light is different from the propagation direction of the light reflected by the blades 220, which will cause part of the scattered detection light to enter the light receiver 40. At this time, the signal strength of the light receiver 40 is P1.

[0069] Since dust 80 is accumulated on the blade 220, when the detection light emitted by the light emitter 30 is irradiated on the blade 220, the detection light emitted by the light emitter 30 will be scattered. At this time, the signal strength P1 of the light receiver 40 will be significantly different from P. Since different dust accumulation degrees correspond to different signal strengths, the dust accumulation degree of the blade 220 of the fan 1 can be judged in this way.

[0070] The angle between the optical axis direction of the detection light and the axial direction of the rotating shaft 110 can be 30°-45°. If the angle between the optical axis direction of the detection light and the axial direction of the rotating shaft 110 is too large, the distance between the light emitter 30 and the light receiver 40 will be too large, which will cause the space occupied by the light emitter 30, the light receiver 40 and the controller 50 to be too large, which is not conducive to the integrated molding of the light emitter 30, the light receiver 40 and the controller 50, and is not beautiful. If the angle between the optical axis direction of the detection light and the axial direction of the rotating shaft 110 is too small, the distance between the light emitter 30 and the light receiver 40 will be too close, which increases the difficulty of installing the light emitter 30 and the light receiver 40. Therefore, the angle between the optical axis direction of the detection light and the axial direction of the rotating shaft 110 can be set to 30°-45°, for example, it can be set to 30°, 40° or 45°.

[0071] Similarly, the axial direction of the receiving hole 410 is The angle of the optical axis direction of the detection light is 30°-45°, and the specific angle can be referred to the angle between the optical axis direction of the detection light and the axial direction of the rotating shaft 110, which will not be elaborated here.

[0072] In some embodiments, the fan 1 may further include a drive motor (not shown), which is connected to the rotating shaft 110 to drive the rotating shaft 110 to rotate. For example, in the present embodiment, the drive motor may be a suspended motor, a brushless DC motor, an AC asynchronous motor, a stepper motor, etc. The suspended motor has a wide speed range, simple control, and low cost. However, the noise is high, the weight of the fan is large, and it is not power-saving enough. The brushless DC motor has the characteristics of high efficiency, low energy consumption, and good stability. Since it uses an external electronic switch to change the direction of the current, it is more durable than a traditional DC motor and has less noise. AC asynchronous motors are widely used in traditional electric fans, with low cost, high reliability, and easy cleaning and maintenance, but the speed accuracy is relatively low and it is easy to damage. Stepper motors are increasingly used due to their high control accuracy and excellent start-stop performance, but the cost of use is high and the control system is relatively complex. Taking all factors into consideration, brushless DC motors have many advantages in fan driving, including high efficiency, low energy consumption, good stability and low noise, etc. The drive motor in the embodiment of the present application is preferably a brushless DC motor. It should be noted that the embodiment of the present application does not limit the specific structure of the drive motor, and users can choose according to actual needs.

[0073] The controller 50 is also electrically connected to the drive motor. The controller 50 is configured to control the drive motor so that at least one of the multiple blades 220 is located on the optical path of the detection light when a shutdown command is received. The controller 50 is also electrically connected to the drive motor. The controller 50 is configured to control the light emitter 30 to emit the detection light and control the light receiver 40 to receive the detection light when the blade 220 is located on the optical path of the detection light. The dust accumulation state of the blade 220 is determined based on the signal strength of the received detection light.

[0074] For example, the above-mentioned control method can be that when controller 50 receives a shutdown command, the drive motor stops working, and blade 220 continues to rotate under inertia. When the rotation speed of blade 220 is at a lower speed, such as 2s / rid, controller 50 can control light emitter 30 to emit a detection light. If light receiver 40 receives the detection light, this means that a certain blade 220 is in the detection path of the detection light at this time, and controller 50 can control the shaft brake to stop blade 220 from rotating.

[0075] Furthermore, the fan 1 may also include an automatic cleaning device, which may be provided on the housing 70 and electrically connected to the controller 50. The controller 50 is also configured to issue a prompt message when dust accumulates on the blades 220, and control the automatic cleaning device to start and clean the blades 220. In some embodiments, the automatic cleaning device may be a spraying device for spraying water on the blades 220 for cleaning, and in other embodiments, the automatic cleaning device may also be a rag device for wiping the blades 220 for cleaning. This enables the user to more intuitively understand the current situation of the fan 1, so that the user can clean the blades 220 of the fan 1 in a timely manner. The above-mentioned prompt message may be a sound or a vibration, or may be a prompt message sent to the user's mobile phone, which is not limited here.

[0076] See also Figure 4 , Figure 4 The flowchart of a fan dust accumulation detection method provided by an embodiment of the present application is shown. The embodiment of the present application also provides a fan 1 dust accumulation detection method, the fan 1 includes a light emitter 30 and a light receiver 40, the light emitter 30 is used to emit a detection light, the light path of the detection light intersects with the rotation path of the blade 220 of the fan 1; the light receiver 40 is used to receive the detection light, and the method includes:

[0077] Step S100: controlling the light emitter to emit detection light;

[0078] Step S200: controlling the optical receiver to receive the detection light;

[0079] Step S300: determining whether dust is accumulated on the blade according to the signal strength of the received detection light.

[0080] For details, please refer to Figure 5 , Figure 5 A specific flow chart of a fan dust accumulation detection method provided by an embodiment of the present application is shown. Step S310 may be: if the ratio of the signal intensity of the received detection light to the signal intensity of the emitted detection light is greater than or equal to a preset threshold, it is determined that dust accumulation exists on the blade.

[0081] For example, the signal strength of the detection light emitted by the light emitter 30 may be A, and the signal strength of the detection light received by the light receiver 40 may be B. The above-mentioned preset threshold may be C. It is understandable that C may be set by the user, and different C values ​​may be set according to different scene requirements, for example, C may be set to 1. When A / B is greater than or equal to C, it is considered that the blade 220 has dust accumulation, and when A / B is less than C, it is considered that the blade 220 does not have dust accumulation.

[0082] It should be noted that the method for determining whether the blade 220 has dust accumulation is not limited to the above method. Figure 6 , Figure 6 Another specific flow chart of a fan dust accumulation detection method provided by an embodiment of the present application is shown. Step S320 may be: if the signal intensity of the received detection light is greater than or equal to a preset threshold, it is determined that dust accumulation exists on the blade.

[0083] For example, the intensity of the detection light received by the light receiver 40 may be D1, and the above threshold may be D. It is understandable that D may be set by the user, and different D values ​​may be set according to different scene requirements. When D1 is greater than or equal to D, it is considered that there is dust accumulation on the blade 220. When D1 is less than D, it is considered that there is no dust accumulation on the blade 220.

[0084] For further information, see Figure 7 or Figure 8 , Figure 7 Another specific flow chart of a fan dust accumulation detection method provided by an embodiment of the present application is shown. Figure 8 Another specific flow chart of a fan dust accumulation detection method provided by an embodiment of the present application is shown. The fan 1 dust accumulation detection method may include:

[0085] S400: When it is determined that dust is accumulated on the blades, a prompt message is output.

[0086] So that the user can clean the blades 220 of the fan 1 in time. The above-mentioned prompt information can be a sound or a vibration, or it can be sent to the user's mobile phone, which is not limited here.

[0087] In some embodiments, the fan 1 may further include an automatic cleaning device. After the prompt information is output, the controller may control the automatic cleaning device to start and perform a cleaning operation on the blades 220. This can reduce the user's operations, avoid manual cleaning by the user, and improve the user's convenience.

[0088] The fan 1 and the dust accumulation detection method of the fan 1 provided in the embodiment of the present application are provided with a light emitter 30, a light receiver 40 and a controller 50 in the fan 1, the light emitter 30 is used to emit a detection light on the rotation path of the blade, and the light receiver 40 is used to receive the detection light, and finally the controller 50 is used to determine the dust accumulation degree of the blade 220 according to the detection light received by the light receiver 40. Since the detection light is irradiated on the smooth blade 220 and the dusty blade 220, the scattering direction of the detection light will be different, which will cause the signal strength of the detection light received by the light receiver 40 to be different, and finally it can be determined whether the blade 220 is dusty according to the signal strength of the detection light received by the light receiver 40. The fan 1 provided in the embodiment of the present application has high detection accuracy and can detect the dust accumulation degree of the blade 220 more timely, which solves the problem in the prior art that the user can only judge the dust accumulation degree of the fan 1 by the naked eye and then clean the fan 1, resulting in low judgment accuracy and untimely judgment.

[0089] The working principle of the embodiment of the present application is as follows:

[0090] Turn off the fan, and under the control of the controller, place a blade in the fan between the light receiver and the light transmitter. The controller controls the light transmitter to emit a detection light, which is reflected by the surface of the blade and enters the light receiver. The light receiver receives the detection light and analyzes the intensity of the detection light to determine whether there is dust accumulation on the blade. When dust accumulates on the blade, the controller outputs a prompt message based on the data analyzed by the light receiver to prompt the user to clean the blade in time.

[0091] The above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person skilled in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various implementation modes of the present application, and should all be included in the protection scope of the present application.

Claims

1. A fan, characterized in that: include: A fan blade, the fan blade comprising a mounting portion and a plurality of blades connected to the mounting portion; A light emitter, the light emitter is used to emit a detection light, the light path of the detection light intersects with the rotation path of the plurality of blades; A light receiver, the light receiver is used to receive the detection light scattered by the blade; as well as A controller is electrically connected to the optical receiver and the optical transmitter, and is used to determine the dust accumulation state of the blade according to the detection light received by the optical receiver.

2. The fan according to claim 1, characterized in that The fan further comprises: a base, the base is equipped with a rotating shaft, the mounting portion is mounted on the rotating shaft, and the light emitter and the light receiver are located on the same side of the fan blade.

3. The fan according to claim 1, characterized in that: The angle between the optical axis direction of the detection light and the axial direction of the rotating shaft is 30°-45°.

4. The fan according to claim 1, characterized in that: The optical receiver has a receiving hole, and the angle between the axis direction of the receiving hole and the optical axis direction of the detection light is 30°-45°.

5. The fan according to claim 4, characterized in that: The fan further comprises a collecting lens, which is arranged in the receiving hole and is used to collect the liquid entering the receiving hole. Detect light.

6. The fan according to claim 1, characterized in that: The paddle includes a first area connected to the mounting portion and a second area opposite to the first area, and the optical path of the detection light intersects with the rotation path of the second area of ​​the paddle.

7. The fan according to claim 1, characterized in that: The wavelength of the detection light emitted by the light emitter is 0.76-1000 microns.

8. The fan according to claim 1, characterized in that The fan also includes a drive motor, which is transmission-connected to the shaft to drive the shaft to rotate. The controller is also electrically connected to the drive motor. The controller is configured to control the drive motor so that at least one of the multiple blades is located on the optical path of the detection light when a shutdown command is received. The controller is also electrically connected to the drive motor. The controller is configured to control the light emitter to emit the detection light when the blade is located on the detection light path, and control the light receiver to receive the detection light when a shutdown command is received, and determine the dust accumulation state of the blade based on the signal strength of the received detection light.

9. The fan according to claim 8, characterized in that The controller is also configured to issue a prompt message when dust accumulates on the blade.

10. A method for detecting dust accumulation on a fan, characterized in that: The fan comprises a light emitter and a light receiver, wherein the light emitter is used to emit a detection light, and the light path of the detection light intersects with the rotation path of the blades of the fan; The optical receiver is used to receive detection light, and the method includes: Controlling the light emitter to emit detection light; Controlling the optical receiver to receive detection light; According to the signal intensity of the received detection light, it is determined that dust is accumulated on the blade.

11. The fan dust accumulation detection method according to claim 10, characterized in that: If the ratio of the signal intensity of the received detection light to the signal intensity of the emitted detection light is greater than or equal to a preset threshold, it is determined that dust accumulation exists on the blade.

12. The fan dust accumulation detection method according to claim 10, characterized in that: If the signal intensity of the received detection light is greater than or equal to a preset threshold, it is determined that dust accumulation exists on the blade.

13. The fan dust accumulation detection method according to any one of claims 10 to 12, characterized in that: The method further comprises: When it is determined that dust is accumulated on the blade, a prompt message is output.

14. The fan dust accumulation detection method according to claims 10-12, characterized in that: The fan further comprises: an automatic cleaning device, and the method further comprises: When it is determined that dust is accumulated on the blade, a prompt message is output, and the automatic cleaning device is controlled to start to clean the blade.

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