Rotating speed detection method, computer readable storage medium and equipment with rotating part

Abstract

The invention relates to the technical field of rotating speed detection, in particular to a rotating speed detection method, a computer readable storage medium and equipment with a rotating part. The rotating speed detection method comprises the steps that the preset rotating speed of a rotating part is obtained, and the preset generating capacity of magnetic fluid at the preset rotating speed and the preset magnetic induction intensity needed for achieving the preset generating capacity are obtained; the variable magnetic field is controlled to generate preset magnetic induction intensity, and the rotating piece is controlled to rotate in the variable magnetic field to obtain the actual generating capacity of the magnetofluid; comparing the actual generating capacity with preset generating capacity; if the actual generating capacity is not equal to the preset generating capacity, the actual rotating speed of the rotating part is not equal to the preset rotating speed, and rotating speed abnormity of the rotating part is judged. The actual generating capacity of the magnetic fluid in the rotating part is compared with the preset generating capacity, whether the actual rotating speed of the rotating part is different from the preset rotating speed or not can be known, then whether the rotating speed of the rotating part is abnormal or not is known, and efficient, accurate and reliable rotating speed detection can be achieved in the complex environment.

Description

Technical Field

[0001] The present invention relates to the technical field of rotational speed detection, and in particular to a rotational speed detection method, a computer-readable storage medium, and a device having a rotating part. Background Art

[0002] For devices with rotating parts, such as range hoods with impellers, garbage disposals with grinding discs, and washing machines with wash tubs, the set speed often mismatches with the actual speed after long-term use. Furthermore, due to the limitations of the operating environment, detecting the rotating parts' speed is often difficult. For example, range hoods operate in a complex environment, often accompanied by high temperatures, high humidity, and contamination from oily smoke particles. These factors can interfere with traditional speed detection devices, leading to inaccurate measurements and even damage to the device. Summary of the Invention

[0003] In view of this, the present invention provides a rotational speed detection method to address the current difficulty in detecting the rotational speed of a rotating part in a device having a rotating part. Furthermore, the present invention provides a computer-readable storage medium. Furthermore, the present invention provides a device having a rotating part.

[0004] In a first aspect, the present invention provides a rotational speed detection method, wherein a magnetic fluid is provided in a rotating member for performing rotational speed detection, and the rotating member is disposed in a variable magnetic field, and the magnetic fluid is capable of rotating with the rotating member in the variable magnetic field and generating electricity; The rotation speed detection method comprises: Obtaining a preset rotational speed of the rotating member, and obtaining a preset power generation amount of the magnetic fluid at the preset rotational speed, and a preset magnetic induction intensity required to achieve the preset power generation amount; Controlling the variable magnetic field to generate the preset magnetic induction intensity and controlling the rotating member to rotate in the variable magnetic field to obtain the actual power generation of the magnetic fluid; comparing the actual power generation with the preset power generation; If the actual power generation is not equal to the preset power generation, the actual rotational speed of the rotating member is not equal to the preset rotational speed, and it is determined that the rotational speed of the rotating member is abnormal; If the actual power generation is equal to the preset power generation, the actual rotational speed of the rotating member is equal to the preset rotational speed, and it is determined that there is no abnormal rotational speed of the rotating member.

[0005] Beneficial effects: The present invention provides a rotational speed detection method, which provides a magnetic fluid that can rotate synchronously with the rotating part in the rotating part, and provides a variable magnetic field so that the magnetic fluid can rotate with the rotating part in the variable magnetic field to generate electricity. Then, by comparing the actual power generation with the preset power generation, it can be known whether there is a difference between the actual rotational speed of the rotating part and the preset speed, and then it can be known whether there is an abnormal rotational speed of the rotating part. The rotational speed detection method is simple and efficient, and can realize efficient, accurate and reliable rotational speed detection in complex environments.

[0006] In an optional embodiment, after determining whether the rotation speed of the rotating part is abnormal, the method further includes: The magnetic induction intensity generated in the variable magnetic field is adjusted so that the actual power generation of the magnetic fluid is equal to the preset power generation.

[0007] Beneficial effect: By adjusting the magnetic induction intensity generated in the variable magnetic field so that the actual power generation of the magnetic fluid is equal to the preset power generation, the deviation between the actual speed of the rotating part and the preset speed can be reflected by the change in the magnetic induction intensity.

[0008] In an optional embodiment, after adjusting the magnetic induction intensity generated in the variable magnetic field so that the actual power generation of the magnetic fluid is equal to the preset power generation, the method further includes: Obtaining the difference between the adjusted magnetic induction intensity and the preset magnetic induction intensity as the actual adjustment amount; comparing the actual adjustment amount with a preset adjustment amount; If the actual adjustment amount is greater than the preset adjustment amount, it is determined that the actual rotational speed of the rotating member differs greatly from the preset rotational speed, and an error report is required for maintenance; If the actual adjustment amount is less than or equal to the preset adjustment amount, it is determined that the actual rotational speed of the rotating part is slightly different from the preset rotational speed, and the device can continue to be used without reporting an error.

[0009] Beneficial effect: By taking the difference between the adjusted magnetic induction intensity and the preset magnetic induction intensity as the actual adjustment amount and comparing it with the preset adjustment amount, it is judged whether the actual adjustment amount, that is, the change in the magnetic induction intensity in the variable magnetic field, is too large, thereby judging whether the rotating parts and their equipment need to report an error, which is convenient for users to repair on demand.

[0010] In an optional embodiment, the preset power generation amount is the maximum power generation amount generated when the magnetic fluid rotates with the rotating member at a preset speed in a variable magnetic field.

[0011] Beneficial effect: The maximum power generation generated by the magnetic fluid rotating with the rotating part at a preset speed in a variable magnetic field is used as the standard preset power generation, ensuring accuracy when comparing the actual power generation with the preset power generation.

[0012] In an optional embodiment, obtaining the preset power generation of the magnetic fluid at the preset speed and the preset magnetic induction intensity required to achieve the preset power generation includes: When the device having the rotating member is used for the first time, controlling the magnetic fluid to rotate along with the rotating member at the preset speed in the variable magnetic field; Increasing the magnetic induction intensity generated in the variable magnetic field and monitoring the change in the power generation of the magnetic fluid in real time; When the power generation of the magnetic fluid is monitored to no longer increase, the power generation of the magnetic fluid is recorded as the preset power generation, and the magnetic induction intensity generated in the variable magnetic field is recorded as the preset magnetic induction intensity.

[0013] Beneficial Effects: The preset speed is the speed achieved when the equipment is first used or during pre-shipment inspection. At this standard speed, the magnetic induction intensity generated in the variable magnetic field is continuously increased until the power generation of the magnetic fluid reaches its maximum and no longer changes. The power generation and magnetic induction intensity at this time are the standard power generation and standard magnetic induction intensity of the rotating part at the preset speed.

[0014] In a second aspect, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions. When the computer instructions are executed, the rotational speed detection method described in the above embodiment is implemented.

[0015] Beneficial effects: The present invention also provides a computer-readable storage medium. The computer-readable storage medium provided by the present invention has all the technical effects of the above-mentioned speed detection method by adopting the speed detection method of the above-mentioned embodiment.

[0016] In a third aspect, the present invention further provides a device having a rotating member, comprising: This machine is provided with a chamber; a rotating member disposed in the chamber, wherein the rotating member can be driven to rotate; a magnetic field generating device, disposed in the chamber and capable of generating a variable magnetic field; a magnetic fluid disposed in the rotating member, the magnetic fluid being capable of rotating along with the rotating member in a variable magnetic field; A controller is communicatively connected to the rotating member, the magnetic field generating device and the magnetic fluid, and is used to execute the rotation speed detection method described in the above embodiment.

[0017] Beneficial effects: The present invention also provides a device with a rotating part, which controls the rotation of the rotating part and the magnetic fluid thereon by arranging the rotating part, a magnetic field generating device, and a magnetic fluid in the chamber of the machine, and regulating the rotating part through a controller that is communicatively connected to the rotating part, the magnetic field generating device, and the magnetic fluid. By comparing the actual power generation of the magnetic fluid with the preset power generation, it is determined whether there is a difference between the actual rotational speed of the rotating part and the preset rotational speed, and then it is determined whether there is an abnormal rotational speed of the rotating part.

[0018] In an optional embodiment, the magnetic field generating device includes a first magnetic pole and a second magnetic pole, and the first magnetic pole and the second magnetic pole are respectively arranged on both sides of the axial direction of the rotating part.

[0019] Beneficial effect: The magnetic field generating device generates a variable magnetic field through the first magnetic pole and the second magnetic pole that are arranged opposite to each other, thereby generating a variable magnetic induction intensity.

[0020] In an optional embodiment, the device having a rotating part further includes an electrical device electrically connected to the magnetic fluid, and the electrical device can utilize the electricity generated by the magnetic fluid.

[0021] Beneficial effect: By electrically connecting the electrical device to the magnetic fluid, the electrical device can utilize the electricity generated by the magnetic fluid, which is energy-saving and environmentally friendly.

[0022] In an optional embodiment, the device having a rotating part is a range hood, and the rotating part is a fan wheel of the range hood.

[0023] Beneficial effect: It is convenient to detect whether the speed of the fan wheel of the range hood is abnormal.

[0024] In an optional embodiment, the electrical device is a heating element provided in the wind wheel, and the heating element can utilize the electricity generated by the magnetic fluid to heat the wind wheel to perform hot melt washing on the wind wheel.

[0025] Beneficial effect: The electrical device is set as a heating element and arranged in the wind wheel. The heating element converts the electricity generated by the magnetic fluid into thermal energy to heat the wind wheel, so as to facilitate hot melt cleaning of the wind wheel and keep the wind wheel clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1An overall flow chart of a rotation speed detection method provided by the present invention; Figure 2 A first flow chart of a rotation speed detection method provided by the present invention; Figure 3 A second flow chart of a rotation speed detection method provided by the present invention; Figure 4 A third flow chart of a rotation speed detection method provided by the present invention; Figure 5 A flow chart of obtaining a preset power generation amount and a preset magnetic induction intensity in a rotation speed detection method provided by the present invention; Figure 6 A fourth flow chart of a rotation speed detection method provided by the present invention; Figure 7 A schematic structural diagram of a device with a rotating part provided by the present invention; Figure 8 A schematic diagram of the internal structure of a device with a rotating part provided by the present invention; Figure 9 A cross-sectional view of a device having a rotating part provided by the present invention; Figure 10 Schematic diagram of the magnetic fluid provided by the present invention.

[0028] Description of reference numerals: 1. This machine; 2. Chamber; 3. Rotating parts; 4. Magnetic fluid; 401. First electrode; 402. Second electrode; 5. First magnetic pole; 6. Second magnetic pole; 7. Heating element; 8. Rotating shaft; 9. Motor. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] The following combination Figures 1-10 , describing embodiments of the present invention.

[0034] According to an embodiment of the present invention, on the one hand, a rotational speed detection method is provided, wherein a magnetic fluid is provided in a rotating part for rotational speed detection, and the rotating part is provided in a variable magnetic field. The magnetic fluid can rotate with the rotating part in the variable magnetic field and generate electricity.

[0035] Specifically, when a magnetic fluid rotates with a rotating member in a variable magnetic field, the positive and negative ions in the magnetic fluid first gather at the outer electrodes of the magnetic fluid due to centrifugal force. Then, the magnetic field exerts a Lorentz force on either the positive or negative ions. The positive or negative ions, affected by the Lorentz force, move from the outer electrodes of the magnetic fluid toward the inner electrodes and gather there, generating a potential difference between the inner and outer electrodes, enabling power generation. The specific electrical properties of the ions affected by the Lorentz force are determined by the direction of the magnetic field.

[0036] This embodiment provides a rotation speed detection method, such as Figure 1 、 Figure 2 Shown, including: S1: obtaining a preset rotational speed of the rotating member, and obtaining a preset power generation amount of the magnetic fluid at the preset rotational speed, and a preset magnetic induction intensity required to achieve the preset power generation amount; S2: Controlling the variable magnetic field to generate a preset magnetic induction intensity and controlling the rotating member to rotate in the variable magnetic field to obtain the actual power generation of the magnetic fluid; S3: Compare the actual power generation with the preset power generation; S4: If the actual power generation is not equal to the preset power generation, then the actual rotational speed of the rotating member is not equal to the preset rotational speed, and it is determined that the rotational speed of the rotating member is abnormal; S5: If the actual power generation is equal to the preset power generation, the actual rotational speed of the rotating member is equal to the preset rotational speed, and it is determined that there is no rotational speed abnormality of the rotating member.

[0037] In the above embodiment, by arranging a magnetic fluid that can rotate synchronously with the rotating part, and arranging a variable magnetic field so that the magnetic fluid can rotate with the rotating part in the variable magnetic field to generate electricity, and then by comparing the actual power generation with the preset power generation, it can be known whether there is a difference between the actual speed of the rotating part and the preset speed, and then it can be known whether there is an abnormal speed of the rotating part. The speed detection method is simple and efficient, and can achieve efficient, accurate and reliable speed detection in complex environments.

[0038] Specifically, for devices with rotating parts, after long-term use, the set speed of the rotating parts often does not match the actual speed. That is, the preset speed input into the startup program is different from the actual operating speed of the rotating parts. In this embodiment, the preset speed of the rotating part is obtained as the speed reached when the device is first used or during pre-factory inspection. This speed is the preset speed. The preset power generation of the magnetic fluid at the preset speed and the preset magnetic induction intensity required to achieve the preset power generation are actually the power generation that the rotating part can achieve at the preset speed and the corresponding magnetic induction intensity at this time. This is used as a standard to measure whether the rotating part can reach the initial preset speed after long-term use. At the same time, by inputting multiple corresponding sets of preset power generation and preset magnetic induction intensities into the relevant program, it is possible to detect whether the actual speed of the device reaches the preset speed at different speed gears.

[0039] Furthermore, if Figure 1 、 Figure 2 As shown, after the rotating part has been used for a long time, a preset magnetic induction intensity is generated in the controlled variable magnetic field. Under the premise that the magnetic induction intensity remains unchanged, the power generation of the magnetic fluid when the rotating part rotates is only affected by the rotation speed. Therefore, by comparing the actual power generation with the preset power generation, it can be known whether there is a difference between the actual rotation speed of the rotating part and the preset rotation speed, and then whether there is an abnormal rotation speed of the rotating part, so as to facilitate subsequent maintenance and replacement operations.

[0040] Furthermore, the magnetic induction lines in the variable magnetic field are perpendicular to the cross section of the magnetic fluid, so that the ions in the magnetic fluid are acted upon by the Lorentz force and move from the outer electrode of the magnetic fluid to the inner electrode of the magnetic fluid.

[0041] Furthermore, the detection of the actual power generation can be achieved by the current detection circuit of the controller, and the specific power generation detection method is determined according to the product.

[0042] In some embodiments, as Figure 1 、 Figure 3 As shown, after determining whether the rotating part has an abnormal speed, the following steps are also included: S6: Adjusting the magnetic induction intensity generated in the variable magnetic field so that the actual power generation of the magnetic fluid is equal to the preset power generation.

[0043] In the above embodiment, by adjusting the magnetic induction intensity generated in the variable magnetic field so that the actual power generation of the magnetic fluid is equal to the preset power generation, the deviation between the actual speed of the rotating part and the preset speed can be reflected by the change in the magnetic induction intensity.

[0044] Specifically, if Figure 1 、 Figure 3 As shown, the variable magnetic induction intensity in the variable magnetic field can be specifically generated by devices such as a coil with adjustable current, a coil with adjustable number of turns, etc.

[0045] In some embodiments, as Figure 1 、 Figure 4 As shown, after adjusting the magnetic induction intensity generated in the variable magnetic field so that the actual power generation of the magnetic fluid is equal to the preset power generation, the method further includes: S7: Obtaining the difference between the adjusted magnetic induction intensity and the preset magnetic induction intensity as the actual adjustment amount; S8: Compare the actual adjustment amount with the preset adjustment amount; S9: If the actual adjustment amount is greater than the preset adjustment amount, it is determined that the actual speed of the rotating part differs greatly from the preset speed, and an error is required for maintenance; S10: If the actual adjustment amount is less than or equal to the preset adjustment amount, it is determined that the actual rotational speed of the rotating part is slightly different from the preset rotational speed, and the system can continue to be used without reporting an error.

[0046] In the above embodiment, by taking the difference between the adjusted magnetic induction intensity and the preset magnetic induction intensity as the actual adjustment amount and comparing it with the preset adjustment amount, it is judged whether the actual adjustment amount, that is, the change in the magnetic induction intensity in the variable magnetic field, is too large, thereby judging whether the rotating parts and their equipment need to report an error, so that users can repair them as needed.

[0047] Specifically, if Figure 1 、 Figure 4As shown, the preset adjustment amount is confirmed based on pre-shipment testing. When the actual adjustment amount of the magnetic induction intensity in the variable magnetic field is greater than the preset adjustment amount, it indicates that the actual speed differs significantly from the preset speed. If repairs are not performed, there is a risk of equipment damage. Therefore, an error report is required and the equipment must be shut down for repairs. When the actual adjustment amount of the magnetic induction intensity in the variable magnetic field is less than or equal to the preset adjustment amount, it indicates that the actual speed differs slightly from the preset speed. In this case, the speed error of the rotating parts of the equipment is small, and the equipment can continue to be used without an error report.

[0048] Furthermore, in this embodiment, there is no restriction on the error reporting prompt method. The error reporting prompt method is determined by the product and can serve as a prompt, such as a buzzer, a flashing light device, etc.

[0049] In some embodiments, the preset power generation amount is the maximum power generation amount generated when the magnetic fluid rotates with the rotating member at a preset speed in a variable magnetic field.

[0050] In the above embodiment, the maximum power generation generated by the magnetic fluid rotating with the rotating member in the variable magnetic field at a preset speed is used as the standard preset power generation to ensure accuracy when comparing the actual power generation with the preset power generation.

[0051] Specifically, when the rotating member drives the magnetic fluid to rotate in a variable magnetic field with a preset speed as the standard speed, when the magnetic fluid reaches the maximum power generation as the magnetic induction intensity changes, it is the standard power generation of the magnetic fluid at the preset speed.

[0052] In some embodiments, as Figure 5 、 Figure 6 As shown, obtaining a preset power generation amount of the magnetic fluid at a preset speed and a preset magnetic induction intensity required to achieve the preset power generation amount includes: S11: When the device having the rotating part is used for the first time, controlling the magnetic fluid to rotate with the rotating part at a preset speed in a variable magnetic field; S12: increasing the magnetic induction intensity generated in the variable magnetic field and monitoring the change in the power generation of the magnetic fluid in real time; S13: When the power generation of the monitored magnetic fluid no longer increases, the power generation of the magnetic fluid is recorded as the preset power generation, and the magnetic induction intensity generated in the variable magnetic field is recorded as the preset magnetic induction intensity.

[0053] In the above embodiment, the preset speed is the speed achieved when the device is first used or during pre-shipment testing. At this standard speed, the magnetic flux density generated in the variable magnetic field is continuously increased until the power generation of the magnetic fluid reaches its maximum and no longer changes. The power generation and magnetic flux density at this time are the standard power generation and magnetic flux density of the rotating element at the preset speed.

[0054] Specifically, if Figure 5 、 Figure 6 As shown, after the device is started for the first time, the controller drives the motor to drive the rotating part to rotate at a preset speed; the positive and negative ions in the magnetic fluid gather at the outer electrode under the action of centrifugal force; the variable magnetic field generates a magnetic field in the direction of the rotating axis with an initial magnetic induction intensity; the positive ions or negative ions in the magnetic fluid gather at the inner electrode under the action of the Lorentz force, so that the positive and negative ions gather at the outer electrode and the inner electrode respectively to generate electricity, and the actual power generation is obtained; the magnetic induction intensity generated by the variable magnetic field is increased, so that the Lorentz force on the positive ions or negative ions increases, and the amount of positive ions or negative ions gathered at the inner electrode continues to increase, so that the potential difference between the inner and outer electrodes of the magnetic fluid continues to increase, thereby increasing the actual power generation; it is judged whether the actual power generation no longer increases. When the power generation of the monitored magnetic fluid no longer increases, the power generation of the magnetic fluid is recorded as the preset power generation, and the magnetic induction intensity generated in the variable magnetic field is recorded as the preset magnetic induction intensity.

[0055] Furthermore, the greater the rotational speed of the rotating part, the greater the centrifugal force, and the greater the magnetic induction intensity required to gather positive ions or negative ions on the inner edge electrode under the action of the Lorentz force, thereby obtaining different preset power generation and different preset magnetic induction intensities corresponding to different preset rotational speeds; by inputting the corresponding multiple sets of preset power generation and preset magnetic induction intensities into the relevant program, it is possible to detect whether the actual speed of the equipment reaches the preset speed at different speed gears.

[0056] Furthermore, the first time the device is started can be when the user uses it for the first time or during the factory inspection; accordingly, when determining the standard power generation and standard magnetic induction intensity as the preset power generation and preset magnetic induction intensity, the user can obtain and input the relevant program by himself, or can obtain and input the relevant program in advance through testing during the factory inspection.

[0057] According to an embodiment of the present invention, on the other hand, a computer-readable storage medium is provided. The computer-readable storage medium stores computer instructions. When the computer instructions are executed, the rotation speed detection method of the above embodiment is implemented.

[0058] In the above embodiment, the computer-readable storage medium provided in this embodiment has all the technical effects of the above rotational speed detection method by adopting the rotational speed detection method of the above implementation.

[0059] According to an embodiment of the present invention, in another aspect, a device having a rotating member is provided, such as Figure 7 、 Figure 8 、 Figure 9 As shown, it includes: this machine 1, a chamber 2, a rotating part 3, a magnetic field generating device, a magnetic fluid 4 and a controller.

[0060] This machine 1 is provided with a chamber 2; a rotating member 3 is provided in the chamber 2, and the rotating member 3 can be driven to rotate; a magnetic field generating device is provided in the chamber 2 and can form a variable magnetic field; a magnetic fluid 4 is provided in the rotating member 3, and the magnetic fluid 4 can rotate with the rotating member 3 in the variable magnetic field; the controller is communicatively connected with the rotating member 3, the magnetic field generating device and the magnetic fluid 4, and is used to execute the speed detection method of the above-mentioned embodiment.

[0061] In the above embodiment, a rotating part 3, a magnetic field generating device, and a magnetic fluid 4 are arranged in the chamber 2 of the machine 1, and are controlled by a controller that is communicatively connected to the rotating part 3, the magnetic field generating device, and the magnetic fluid 4, so as to control the rotation of the rotating part 3 and the magnetic fluid 4 thereon. By comparing the actual power generation of the magnetic fluid 4 with the preset power generation, it is determined whether there is a difference between the actual rotational speed of the rotating part 3 and the preset rotational speed, and further it is determined whether there is an abnormal rotational speed of the rotating part 3.

[0062] Specifically, if Figure 9 As shown, magnetic fluid 4 is disposed in the internal cavity of rotating member 3. Magnetic fluid 4 is distributed continuously throughout the entire circumference of the internal cavity of rotating member 3, or is arranged in multiple sections and distributed sequentially along the circumference of rotating member 3. It should be noted that the amount of magnetic fluid 4 affects the number of positive and negative ions therein, and thus the power generation. For example, if the magnetic fluid 4 does not fill the cavity, the number of positive and negative ions will be low, the resulting power generation will also be low, and the maximum speed of rotating member 3 detected will also be low. Therefore, in practical applications, the cavity shape of rotating member 3 and the amount of magnetic fluid can be dynamically adjusted according to the maximum speed of the product.

[0063] Furthermore, if Figure 10 As shown, in this embodiment, the outer electrode of the magnetic fluid 4 is defined as the first electrode 401, and the inner electrode of the magnetic fluid 4 is defined as the second electrode 402. When the magnetic fluid 4 rotates with the rotating member in a variable magnetic field, the positive and negative ions in the magnetic fluid 4 are first gathered at the first electrode 401 of the magnetic fluid 4 due to the centrifugal force. Then, due to the effect of the magnetic field, a Lorentz force is generated on one of the positive ions and the negative ions. The positive ions or negative ions acted upon by the Lorentz force move from the first electrode 401 of the magnetic fluid 4 to the second electrode 402 of the magnetic fluid 4 and gather at the second electrode 402 of the magnetic fluid 4, thereby generating a potential difference between the first electrode 401 and the second electrode 402 of the magnetic fluid 4, thereby enabling power generation.

[0064] Furthermore, the magnetic field generating device can be configured as a coil with adjustable current, a coil with adjustable number of turns, or the like.

[0065] Furthermore, if Figure 9 As shown, a motor 9 having a rotating shaft 8 is installed on the machine 1, and the rotating member 3 is fixedly connected to the rotating shaft 8, so as to be driven by the rotation of the motor 9 through the rotating shaft 8.

[0066] In some embodiments, as Figure 9 As shown, the magnetic field generating device includes a first magnetic pole 5 and a second magnetic pole 6 , and the first magnetic pole 5 and the second magnetic pole 6 are respectively arranged on both sides of the axial direction of the rotating member 3 .

[0067] In the above embodiment, the magnetic field generating device generates a variable magnetic field through the first magnetic pole 5 and the second magnetic pole 6 that are arranged opposite to each other, thereby generating a variable magnetic induction intensity.

[0068] Specifically, if Figure 9 As shown, the first magnetic pole 5 is located on the inner end surface of the motor 9 behind the rotating member 3, and the second magnetic pole 6 is located in the cavity 2 in front of the rotating member 3.

[0069] In some embodiments, the device having a rotating part further includes an electrical device electrically connected to the magnetic fluid 4 , and the electrical device can utilize the electricity generated by the magnetic fluid 4 .

[0070] In the above embodiment, by electrically connecting the electrical device to the magnetic fluid 4 , the electrical device can utilize the electricity generated by the magnetic fluid 4 , thereby saving energy and protecting the environment.

[0071] Specifically, the electrical device may be an electrical storage device such as a battery, or an electrical consumption device such as an electric lamp.

[0072] In some embodiments, as Figure 7 、 Figure 8 、 Figure 9 As shown, the device with the rotating part is a range hood, and the rotating part 3 is the fan wheel of the range hood.

[0073] In the above embodiment, it is convenient to detect whether the rotation speed of the fan wheel of the range hood is abnormal.

[0074] Specifically, if Figure 9 As shown, the chamber 2 of the machine 1 is a ventilation duct of the range hood, and the fan wheel of the range hood is arranged in the ventilation duct.

[0075] In some embodiments, as Figure 9 As shown, the electrical device is a heating element 7 provided in the wind wheel. The heating element 7 can utilize the electricity generated by the magnetic fluid 4 to heat the wind wheel so as to perform heat melting and washing on the wind wheel.

[0076] In the above embodiment, the electrical device is set as a heating element 7 and is arranged in the wind wheel. The heating element 7 converts the electricity generated by the magnetic fluid 4 into thermal energy to heat the wind wheel, so as to facilitate hot melt cleaning of the wind wheel and keep the wind wheel clean.

[0077] Specifically, if Figure 9 As shown, the heating element 7 is arranged in the inner cavity of the wind wheel, and the installation position does not interfere with the installation position of the magnetic fluid 4.

[0078] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by this application.

Claims

1. A rotation speed detection method, characterized in that: A magnetic fluid is provided in a rotating member for detecting rotational speed, and the rotating member is provided in a variable magnetic field. The magnetic fluid can rotate with the rotating member in the variable magnetic field and generate electricity; The rotation speed detection method comprises: Obtaining a preset rotational speed of the rotating member, and obtaining a preset power generation amount of the magnetic fluid at the preset rotational speed, and a preset magnetic induction intensity required to achieve the preset power generation amount; Controlling the variable magnetic field to generate the preset magnetic induction intensity and controlling the rotating member to rotate in the variable magnetic field to obtain the actual power generation of the magnetic fluid; comparing the actual power generation with the preset power generation; If the actual power generation is not equal to the preset power generation, the actual rotational speed of the rotating member is not equal to the preset rotational speed, and it is determined that the rotational speed of the rotating member is abnormal; If the actual power generation is equal to the preset power generation, the actual rotational speed of the rotating member is equal to the preset rotational speed, and it is determined that there is no abnormal rotational speed of the rotating member.

2. The rotation speed detection method according to claim 1, characterized in that: After determining that the rotational speed of the rotating part is abnormal, the method further includes: The magnetic induction intensity generated in the variable magnetic field is adjusted so that the actual power generation of the magnetic fluid is equal to the preset power generation.

3. The rotation speed detection method according to claim 2, characterized in that: After adjusting the magnetic induction intensity generated in the variable magnetic field so that the actual power generation of the magnetic fluid is equal to the preset power generation, the method further includes: Obtaining the difference between the adjusted magnetic induction intensity and the preset magnetic induction intensity as the actual adjustment amount; comparing the actual adjustment amount with a preset adjustment amount; If the actual adjustment amount is greater than the preset adjustment amount, it is determined that the actual rotational speed of the rotating member differs greatly from the preset rotational speed, and an error report is required for maintenance; If the actual adjustment amount is less than or equal to the preset adjustment amount, it is determined that the actual rotational speed of the rotating part is slightly different from the preset rotational speed, and the device can continue to be used without reporting an error.

4. The rotation speed detection method according to claim 1, characterized in that: The preset power generation amount is the maximum power generation amount generated when the magnetic fluid rotates with the rotating member at a preset speed in a variable magnetic field.

5. The rotation speed detection method according to claim 4, characterized in that: The obtaining of the preset power generation amount of the magnetic fluid at the preset speed and the preset magnetic induction intensity required to achieve the preset power generation amount includes: When the device having the rotating member is used for the first time, controlling the magnetic fluid to rotate along with the rotating member at the preset speed in the variable magnetic field; Increasing the magnetic induction intensity generated in the variable magnetic field and monitoring the change in the power generation of the magnetic fluid in real time; When the power generation of the magnetic fluid is monitored to no longer increase, the power generation of the magnetic fluid is recorded as the preset power generation, and the magnetic induction intensity generated in the variable magnetic field is recorded as the preset magnetic induction intensity.

6. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and when the computer instructions are executed, the rotation speed detection method according to any one of claims 1 to 5 is implemented.

7. A device having a rotating part, characterized in that include: The machine (1) is provided with a chamber (2); A rotating member (3) is provided in the chamber (2), and the rotating member (3) can be driven to rotate; A magnetic field generating device, disposed in the chamber (2) and capable of generating a variable magnetic field; A magnetic fluid (4) is provided in the rotating member (3), and the magnetic fluid (4) is capable of rotating with the rotating member (3) in a variable magnetic field; A controller is communicatively connected to the rotating member (3), the magnetic field generating device and the magnetic fluid (4), and is used to execute the rotation speed detection method according to any one of claims 1 to 5.

8. The device with a rotating element according to claim 7, characterized in that The magnetic field generating device comprises a first magnetic pole (5) and a second magnetic pole (6), wherein the first magnetic pole (5) and the second magnetic pole (6) are respectively arranged on two axial sides of the rotating member (3).

9. The device having a rotating member according to claim 7, characterized in that The device having a rotating part further comprises an electric device electrically connected to the magnetic fluid (4), and the electric device is capable of utilizing the amount of electricity generated by the magnetic fluid (4).

10. The device with a rotating element according to claim 9, characterized in that The device having a rotating part is a range hood, and the rotating part (3) is the fan wheel of the range hood.

11. The device having a rotating element according to claim 10, characterized in that The electrical device is a heating element (7) provided in the wind wheel, and the heating element (7) can utilize the amount of electricity generated by the magnetic fluid (4) to heat the wind wheel so as to perform thermal melting and washing on the wind wheel.

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