Novel blade online monitoring system

Abstract

A novel blade online monitoring system comprises a blade body, a photoresistor, a controller, a light intensity sensor and a control system, the photoresistor is embedded in the blade body, the photoresistor is connected with the controller outside the blade body through a signal line, and the controller is connected with the light intensity sensor and the control system through data lines; according to the utility model, high-sensitivity photoresistors are installed at specific positions in the blade in a segmented manner, and external environment illumination is combined as a reference, so that the system can continuously monitor and record light intensity changes; the method is suitable for capturing tiny damage signs which are difficult to find by a traditional monitoring technology. And the reliability of the monitoring data is high, the false alarm rate is low, and a new technical approach is provided for early warning of the potential risk of the blade in advance.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation devices, in particular to a novel blade online monitoring system. Background Art

[0002] As an important part of the renewable energy sector, wind power generation is directly related to the stability and sustainability of energy supply through its efficient and safe operation. However, blades, one of the core components of wind turbines, are exposed to complex and changing natural environments for a long time, and are affected by wind and sand erosion, lightning strikes, fatigue loads and other factors. They are prone to damage such as cracks, corrosion, and fractures. If these damages are not discovered and repaired in time, they will not only reduce the power generation efficiency of wind turbines, but may also cause serious safety accidents.

[0003] Traditional blade monitoring technologies, such as those based on noise and vibration analysis, are effective in identifying large structural damage, but their sensitivity and accuracy are clearly insufficient when it comes to minor or early stage damage. This is because in the normal operation of wind turbines, the noise and vibration signals generated by the rotation of the blades are extremely strong, and these signals often mask the slight changes caused by minor damage, resulting in a "blind spot" in damage monitoring. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a new type of blade online monitoring system. By installing high-sensitivity photoresistors in sections at specific positions inside the blades, combined with external ambient light as a reference, the system can continuously monitor and record these light intensity changes; it is suitable for capturing those minor damage signs that are difficult to detect with traditional monitoring technology. The monitoring data has high reliability and low false alarm rate, providing a new technical approach for early warning of potential risks of blades.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A novel blade online monitoring system includes a blade body, a photoresistor, a controller, a light intensity sensor and a control system. A photoresistor is buried inside the blade body. The photoresistor is connected to the controller outside the blade body through a signal line. The controller is connected to the light intensity sensor and the control system through a data line.

[0007] In a preferred solution, photoresistors are evenly distributed inside the blade body along the length direction of the blade body, and are added in key areas along the width direction of the blade body to form a three-dimensional monitoring network to capture subtle changes in light transmittance caused by damage.

[0008] In a preferred embodiment, the blade body includes an outer coating, a blade wall, a reinforcement plate, a mounting plate and a sandwich material; an outer coating is provided on the outer side of the blade wall, a reinforcement plate is supported in the middle of the blade wall, a mounting plate is vertically connected to the middle of the support plate, and sandwich material is filled between the reinforcement plate, the support plate and the inner wall of the blade wall.

[0009] In a preferred solution, light-guiding grooves are equidistantly formed at the upper and lower end surfaces of the mounting plate, and photoresistors are evenly clamped in the light-guiding grooves.

[0010] In a preferred solution, a reflective layer is provided inside the wall of the light guide groove.

[0011] A new blade online monitoring system has the following advantages:

[0012] 1. Photoresistor technology can keenly capture the slight changes in light intensity inside the blades. Even the microcracks or slight wear formed in the early stages of the blades can be discovered in time in the early stages of damage development. Compared with traditional vibration or noise monitoring, this greatly improves the ability to identify subtle damage, helps to intervene in maintenance in advance, and avoids the expansion of damage;

[0013] 2. By deploying photoresistors at different positions on the blades and combining the monitored light intensity variation range, the area where the damage occurs can be accurately determined, which makes it possible to quickly locate the damaged part and implement efficient maintenance, shortens the troubleshooting time, and improves maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 This is the overall structural principle diagram of the utility model system;

[0016] Figure 2 This is a sectional plan view of the blade body structure of the utility model;

[0017] Figure 3 This is a cross-sectional view of the internal structure of the blade body of the utility model.

[0018] In the figure: blade body 1, 106, coating 101, blade wall 102, reinforcement plate 103, mounting plate 104, sandwich material 105, light guide groove 106, photoresistor 2, signal line 3, controller 4, light intensity sensor 5, data line 6, control system 7. DETAILED DESCRIPTION

[0019] like Figure 1As shown, a novel blade online monitoring system includes a blade body 1, a photoresistor 2, a controller 4, a light intensity sensor 5 and a control system 7. The photoresistor 2 is buried inside the blade body 1, and the photoresistor 2 is connected to the controller 4 outside the blade body 1 through a signal line 3. The controller 4 is connected to the light intensity sensor 5 and the control system 7 through a data line 6;

[0020] The photoresistor 2 is arranged in the light guide groove 106 inside the blade body 1. As the blade may be slightly damaged or the light transmittance changes during operation, the resistance value of the photoresistor 2 will change accordingly. These changes are transmitted to the controller 4 outside the blade in real time through the signal line 3. The light intensity sensor 5 is installed outside the blade to monitor the ambient light intensity to ensure the environmental calibration of the data. Its signal is also transmitted to the controller 4 through the data line 6; the controller 4 calculates the resistance decreases and the current increases according to I=U / R based on the data collected from the three-dimensional monitoring network (photoresistors arranged along the length and width of the blade), and then calculates the light intensity based on the current;

[0021] The light intensity sensor 5 is outside the wind turbine and sends the measured light intensity of the environment to the controller 4, and the controller 4 measures the light intensity ratio according to the light intensity inside and outside the blade body 1. When the blade wall becomes thinner or damaged, the light intensity ratio changes.

[0022] The preferred solution is Figure 3 As shown, the photoresistors 2 should be evenly arranged along the length of the blade body 1 to ensure that each key area is covered by at least one photoresistor 2, especially the parts of the blade body 1 that are susceptible to damage or stress concentration; the spacing between the photoresistors 2 should be reasonably set according to the length of the blade body 1 and the monitoring accuracy requirements. The spacing should not be too far to avoid the inability to accurately locate the damage position; nor should it be too close to avoid increasing costs and complexity.

[0023] The preferred solution is Figure 2 and Figure 3 As shown, the blade body 1 includes an outer coating 101, a blade wall 102, a reinforcement plate 103, a mounting plate 104 and a sandwich material 105; an outer coating 101 is arranged on the outer side of the blade wall 102, a reinforcement plate 103 is supported in the middle of the blade wall 102, a mounting plate 104 is vertically connected to the middle of the support plate, and the sandwich material 105 is filled between the reinforcement plate 103, the support plate and the inner wall of the blade wall 102, and the sandwich material 105 needs to be lightweight and high-strength to reduce the weight of the blade body 1 while not affecting the installation and maintenance of the monitoring system.

[0024] The preferred solution is Figure 2 and Figure 3As shown, light guide grooves 106 are equidistantly provided at the upper and lower end surfaces of the mounting plate 104, and photoresistors 2 are evenly clamped in the light guide grooves 106; the photoresistors 2 are fixed in the light guide grooves 106 by precise clamping, ensuring that the photoresistors 2 are in close contact with the groove wall, and facilitating future maintenance and replacement. During the installation process, special tools and fixings are used to prevent damage to the photoresistors 2 or the light guide grooves 106 structure;

[0025] A high reflectivity material is laid inside the wall of the light guide groove 106 as a reflective layer, such as silver plating or a special coating, to enhance the efficiency of light transmission to the photoresistor, especially when the incident angle of the light is not good.

[0026] The above embodiments are only preferred technical solutions of the utility model and should not be regarded as limitations of the utility model. Under the premise of non-conflict, the various technical features recorded in the utility model can be combined with each other. The protection scope of the utility model shall be the technical solution recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solution recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the utility model.

Claims

1. A novel blade online monitoring system, comprising a blade body (1), a photoresistor (2), a controller (4), a light intensity sensor (5) and a control system (7), characterized in that: A photoresistor (2) is embedded inside the blade body (1); the photoresistor (2) is connected to a controller (4) outside the blade body (1) via a signal line (3); and the controller (4) is connected to a light intensity sensor (5) and a control system (7) via a data line (6).

2. The novel blade online monitoring system according to claim 1 is characterized in that: The photoresistors (2) are evenly distributed inside the blade body (1) along the length direction of the blade body (1), and are additionally provided in key areas in the width direction of the blade body (1), forming a three-dimensional monitoring network to capture subtle changes in light transmittance caused by damage.

3. The novel blade online monitoring system according to claim 1 is characterized in that: The blade body (1) comprises an outer coating (101), a blade wall (102), a reinforcing plate (103), a mounting plate (104) and a sandwich material (105); a layer of outer coating (101) is arranged on the outer side of the blade wall (102); a reinforcing plate (103) is supported in the middle of the blade wall (102); a mounting plate (104) is vertically connected in the middle of the supporting plate; and the sandwich material (105) is filled between the reinforcing plate (103), the supporting plate and the inner wall of the blade wall (102).

4. The novel blade online monitoring system according to claim 3 is characterized in that: Light guide grooves (106) are equidistantly provided at the upper and lower end surfaces of the mounting plate (104), and photoresistors (2) are evenly clamped in the light guide grooves (106).

5. The novel blade online monitoring system according to claim 4 is characterized in that: A reflective layer is provided inside the wall of the light guide groove (106).

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