An improved structure of fan blade position sensor

Abstract

The present invention discloses an improved structure of a fan blade position sensor, which is installed on a blade hub and includes a bracket provided on the blade hub, a magnetic sensor provided on the bracket, a controller, and a magnetic sensor cleaning device; the controller is signal-connected to the magnetic sensor and the magnetic sensor cleaning device respectively; the magnetic sensor includes a detection head; the magnetic sensor cleaning device includes a box body fixedly connected to the bracket and containing cleaning liquid, a peristaltic pump fixedly connected to the box body, and a nozzle connected to the peristaltic pump; the liquid outlet direction of the nozzle is toward the detection head. The beneficial effects of the present invention are that the cleaning liquid in the box body can be sucked out by the provided peristaltic pump and nozzle to clean the detection head; the provided controller and magnetic sensor can detect the pitch change situation; the reliability of the pitch change system is improved, the equipment malfunction and shutdown are reduced, and the economic benefits are increased.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to an improved structure of a wind turbine blade position sensor. Background Art

[0002] At present, the installed capacity of clean energy such as wind power generation is developing rapidly. In the existing variable pitch control system, the blade position is mostly judged by an encoder plus a magnetic sensor (E2EM-X8B-M1-GD) to ensure the reliable operation of the equipment. During the operation of the equipment, the blades are in a rotating and vibrating environment. The magnetic sensor is easy to loosen, the grease in the blades contaminates the probe, the positioning bracket becomes loose, and the distance between the sensor and the positioning piece changes. These situations lead to sensor signal loss, malfunction of the variable pitch system, and frequent wind turbine shutdowns, causing economic losses and power loss to wind power companies, affecting equipment safety.

[0003] Among existing patents, there is a patent with publication number CN201020213740.0, entitled "Wind Turbine Pitch Sensor Arrangement Structure," which discloses a sensor comprising a pressure sensor, one end of which is located at the blade root, and the other end of which is located within the pitch bearing. This device cannot resolve the problem of a single sensor failing to detect a fault and requires improvement.

[0004] There is another patent with application number CN201621052188.5, named as a test system for the pitch system of a megawatt-class wind turbine. The patent discloses a main control system, a pitch system to be tested and a loading system; the main control system is connected to the pitch system and the loading system in a communication manner, and is used to control the power supply of the pitch system to be tested, the pitch system setting, the pitch system feedback signal processing, and the data acquisition of the loading system; the loading system and the pitch system are connected to load the pitch system through a coupling, and a speed and torque sensor are installed on the coupling to measure the load torque of the pitch system; the speed and torque sensor are electrically connected to the main control system to transmit the signals collected by the speed and torque sensor to the main control system; this patent cannot detect the problem of a single sensor failure; it needs to be improved. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide an improved structure of a fan blade position sensor that can clean the probe part of the sensor and set up dual sensors to avoid the problem of single sensor failure and inability to monitor.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] An improved structure of a fan blade position sensor is installed on a blade hub and comprises a bracket arranged on the blade hub, a magnetic sensor arranged on the bracket, a controller and a magnetic sensor cleaning device; the controller is respectively connected to the magnetic sensor and the magnetic sensor cleaning device for signals.

[0008] Furthermore, the magnetic sensor includes a detection head.

[0009] Furthermore, the magnetic sensor cleaning device includes a box body fixedly connected to the bracket and containing a cleaning liquid, a peristaltic pump fixedly communicated with the box body, and a nozzle communicated with the peristaltic pump.

[0010] Furthermore, a pipeline for communication is provided between the peristaltic pump and the nozzle.

[0011] Furthermore, the peristaltic pump is provided with a driver.

[0012] Furthermore, the driver is connected to the controller by signal. The controller is provided with a timer, which can start the peristaltic pump at a fixed time to clean the detection head.

[0013] Furthermore, the liquid outlet direction of the nozzle is toward the detection head.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The cleaning liquid in the box can be sucked out by the peristaltic pump and nozzle to clean the detection head.

[0016] 2. The controller and magnetic sensor can detect the pitch change situation, improve the reliability of the pitch change system, reduce equipment malfunction and shutdown, and increase economic benefits.

[0017] 3. The blade opening is determined by logically ANDing the position signal of the wind turbine blade angle position using the pitch motor encoder signal and the magnetic sensor (E2EM-X8B-M1-GD) within the PLC, ensuring safe operation of the wind turbine. In actual operation, magnetic sensor failure, loose probe, oil contamination, and other factors can lead to signal loss and cause blade protection to malfunction and shut down. This technology improves the reliability of blade position signals by connecting sensors based on different principles in parallel with the magnetic sensor, reducing equipment malfunctions and enhancing wind turbine safety. The addition of a magnetic sensor (CS1-F) utilizes its light-emitting diode to verify the liveness of the wiring from the PLC to the magnetic probe, enabling quick circuit fault determination. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the installation of the present invention;

[0019] Figure 2This is a schematic diagram of the connection structure between the blade hub and the blades of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the present invention;

[0021] Figure 4 This is a structural diagram of a magnetic sensor cleaning device.

[0022] In the figure: 1-blade hub, 1-1-hub body, 2-blade, 3-inner gear ring, 4-pitch gear rack, 5-pitch gear, 7-bracket, 8-magnetic sensor cleaning device, 9-magnetic sensor, 10-magnetic sensor, 80-housing, 81-peristaltic pump, 82-pipeline, 83-nozzle. DETAILED DESCRIPTION

[0023] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0024] Example 1:

[0025] Please see the attached Figure 1-4 ,

[0026] like Figure 1-2 As shown, the blades 2 of the wind turbine need to be frequently pitched according to the wind speed. The pitching of the blades 2 is to adjust the angle of the blades 2 relative to the blade hub 1. The blade hub 1 is provided with an inner gear ring 3 and a hub body 1-1, and the blade 2 is provided with a pitch gear rack 4; a pitch gear 5 is provided on the pitch gear rack 4, and the pitch gear 5 is meshed with the inner gear ring 3; a magnetic sensor 9 is provided on the blade hub 1 for monitoring the rotation angle of the pitch gear 5;

[0027] An improved structure for a fan blade position sensor, mounted on a blade hub 1, includes a bracket 7 mounted on the blade hub 1, a magnetic sensor 10 mounted on the bracket 7, a controller, and a magnetic sensor cleaning device 8. The controller is signal-connected to the magnetic sensor 10 and the magnetic sensor cleaning device 8, respectively. A strong magnet is installed between the bracket 7 and the blade hub 1 to strengthen the connection between them and prevent inaccurate sensor measurements caused by loose bolts.

[0028] The magnetic sensor 10 includes a detection head.

[0029] The magnetic sensor cleaning device 8 includes a box 80 fixedly connected to the bracket 7 and containing cleaning liquid, a peristaltic pump 81 fixedly connected to the box 80 , and a nozzle 83 connected to the peristaltic pump 81 .

[0030] A pipe 82 for communication is provided between the peristaltic pump 81 and the nozzle.

[0031] The peristaltic pump 81 is provided with a driver.

[0032] The driver is connected to the controller by signal. The controller is equipped with a timer for periodically cleaning the probe. The controller is a PLC controller, using the Siemens S7-300 model, with a timer and a communication module. The communication module can transmit signals from the magnetic sensor 10 and the peristaltic pump 81 to a remote monitoring center via the mobile Internet, allowing the monitoring center to monitor the on-site situation.

[0033] The liquid discharge direction of the nozzle 83 is toward the detection head.

[0034] Magnetic sensors are materials whose magnetic properties change when they are exposed to external factors such as heat, light, pressure, and radiation. This material can be used to create a variety of highly reliable and sensitive sensors. These sensors use magnetic materials as their sensitive elements, hence the name "magnetic sensors."

[0035] The detector of the magnetic sensor is a magnetic probe. When the magnetic probe is working, it forms a static magnetic field around it. When an object made of ferromagnetic metal, such as a rifle or a vehicle, enters this static magnetic field, a new magnetic field is induced, interfering with the original static magnetic field. The interference caused by the target's movement changes the magnetic field, causing the magnetometer pointer to deflect and swing, generating an electrical signal, thereby realizing the detection of people and vehicles carrying weapons. Typical products of magnetic sensors include Honeywell's HMC series of micro magnetoresistive sensors, which are the most sensitive and have the longest detection distance for micro metal target signals in the magnetoresistive series of sensors. This application uses Honeywell's SL353HT magnetic sensor.

[0036] the method of use and working process of the invention,

[0037] The magnetic sensor 10 is installed on the bracket 7, and is installed side by side with the original magnetic sensor 9. It is connected to the controller signal through a connecting line to detect the pitch change of the pitch gear 5;

[0038] When the magnetic probe of the magnetic sensor is contaminated, a timer is provided in the controller. The magnetic probe is cleaned regularly according to the time interval set by the timer. During cleaning, the controller sends a signal to the peristaltic pump 81. The cleaning liquid in the box 80 passes through the pipe 82 and the nozzle 83 to regularly clean the detection head to ensure the accuracy of detection.

[0039] By adding magnetic sensors, the reliability of the variable pitch system is improved, the equipment malfunction and shutdown are reduced, and the economic benefits are increased; the speed of judging magnetic sensor wiring faults is improved, and the fault repair time is shortened.

[0040] Example 2

[0041] The structure of this embodiment is basically the same as that of embodiment 1.

[0042] The difference is that the magnetic sensor 10 is installed side by side with the original blade magnetic sensor 9 (E2EM-X8B-M1-GD), a strong magnet is installed on the positioning bracket 7 of the original blade magnetic sensor 9, and the magnetic sensor 10 is connected to the circuit of the original magnetic sensor 9, forming two sensors with different principles running simultaneously.

[0043] Working Principle: This application installs a magnetic sensor (CS1-F) and a magnetic sensitive sensor (E2EM-X8B-M1-GD) using different principles side by side and connects them in parallel. When either sensor is actuated, an action signal can be transmitted to the PLC, improving the reliability of wind power equipment.

[0044] The working principle of this embodiment is the same as that of embodiment 1, and will not be described in detail.

[0045] Example 3

[0046] This embodiment is essentially the same as the first embodiment, differing in that the cleaning fluid in the housing 80 is a powerful lubricating metal cleaning agent. Patent application number CN02109268.0, entitled "Powerful Lubricating Metal Cleaner," utilizes an emulsifiable surfactant from Vulcan, DAS TECH iNC, or Quokerchemical, with 0.01-0.08% by weight of a detergent, Na₃PO₄, added to the emulsifiable surfactant. This powerful lubricating metal cleaning agent enhances metal cleaning performance, lubrication, and external phase viscosity, dispersing the oil phase, reducing corrosion and extending service life. This reduces fuel consumption, lowers costs, improves steel plate finish, moderates pH, reduces iron powder, and enhances cleanliness.

[0047] The working principle of this embodiment is the same as that of Example 1, so it will not be described in detail. The above is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with this technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention. At present, the technical solution of this application has adopted the best implementation of Example 1 and has been piloted, that is, a small-scale experiment before large-scale mass production of the product. After the pilot was completed, a user usage survey was conducted on a small scale, and the survey results showed that the user satisfaction was high. Now we are preparing to officially put the product into production for industrialization. The preferred implementation of this patent is described in detail above, but this patent is not limited to the above implementation. Within the scope of knowledge possessed by ordinary technicians in this field, various changes can be made without departing from the purpose of this patent.

Claims

1. An improved structure of a fan blade position sensor, mounted on a blade hub (2), characterized in that: It comprises a bracket (7) arranged on a blade hub (2), a magnetic sensor (10) arranged on the bracket (7), a controller, and a magnetic sensor cleaning device (8); the controller is signal-connected to the magnetic sensor (10) and the magnetic sensor cleaning device (8), respectively; The magnetic sensor (10) comprises a detection head; The magnetic sensor cleaning device (8) comprises a box (80) fixedly connected to the bracket (7) and containing a cleaning liquid, a peristaltic pump (81) fixedly connected to the box (80), and a nozzle (83) connected to the peristaltic pump (81); The magnetic sensor (10) is installed side by side with the original blade magnetic sensor (9), a strong magnet is installed on the positioning bracket (7) of the original blade magnetic sensor (9), and the magnetic sensor (10) is connected to the circuit of the original magnetic sensor (9).

2. The improved structure of the fan blade position sensor according to claim 1, characterized in that: A pipeline (82) for communication is provided between the peristaltic pump (81) and the nozzle.

3. The improved structure of the fan blade position sensor according to claim 2, characterized in that: The peristaltic pump (81) is provided with a driver.

4. The improved structure of the fan blade position sensor according to claim 3, characterized in that: The driver is signal-connected to the controller.

5. The improved structure of the fan blade position sensor according to claim 4, characterized in that: The liquid outlet direction of the nozzle (83) is toward the detection head.

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