On-line impeller unbalance monitoring device on top of cabin

Abstract

The utility model provides a cabin top on-line impeller imbalance monitoring device which at least comprises a monitoring device, the monitoring device is a laser radar sensor, the laser radar sensor is installed on the top of a cabin, and a probe of the laser radar sensor faces the left side or the right side of the cabin. And when the blades rotate to the same side of the probe and the blades are horizontal, the probe points to the tips of the blades, so that the distance between each blade tip and the laser radar sensor is monitored. According to the monitoring device, the balance of the impeller is judged by monitoring the distance between the laser radar sensor and the tip of the blade in the mode that the laser radar sensor horizontally emits laser to the right front side or the left front side, the laser radar sensor does not need to stretch out of a cabin and can be stably installed at the top of the cabin, the installation falling risk is avoided, and adjustment of the detection angle of the laser radar sensor can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbine impeller imbalance monitoring, in particular to an online impeller imbalance monitoring device on the top of a cabin. Background Art

[0002] With the rapid development of wind power in China, the failure of existing wind turbines is increasing, especially the vibration failure of wind turbines, which will directly affect the mechanical performance and life of the units. Blades are devices for wind turbines to absorb energy. With the continuous increase in the capacity of wind turbines, blades are getting longer and longer, and the swept area, weight and moment of inertia are also increasing. As the power source of wind turbines, the aerodynamic imbalance of blades will cause additional loads or load imbalances to the units, so the aerodynamic imbalance of blades will reduce the power generation efficiency and the power curve of wind turbines, and will also cause damage to key components such as the pitch system, transmission chain, and yaw system. At the same time, if the impeller imbalance is not resolved for a long time, the fault may become more serious, which will pose a great threat to the reliability and safety of wind turbines. Therefore, it is necessary to detect the impeller imbalance and promptly inspect and maintain the impeller imbalance to ensure the reliability and safety of wind turbines.

[0003] At present, there are vibration method, load method, visual inspection method and other methods for detecting impeller imbalance. However, the vibration method has low measurement accuracy and cannot extract characteristic signals in a timely and effective manner. The load detection method requires accurate load measurement. At present, the maturity of load measurement technology is not high. Due to problems such as pasting process, the measurement consistency is poor, which is easy to cause mismeasurement. The visual inspection method is the main means of measurement and detection at present. It mainly detects the clearance of the blades through offline equipment or video clearance equipment, so as to detect the impeller imbalance problem. This method has high measurement accuracy. However, most video clearance equipment is installed at the bottom of the cabin, and it is necessary to open a hole at the bottom of the fan for installation, which is inconvenient to install. At present, it is possible to consider installing a clearance device outside the cabin at the top of the fan, and measuring the clearance by detecting the distance between the blade and the tower downward, such as patent CN219712776U, but this installation method requires the video clearance device to protrude out of the cabin, which is difficult to install and has the risk of falling. Summary of the invention

[0004] The utility model provides an online impeller imbalance monitoring device on the top of the cabin. The monitoring device determines the balance of the impeller by monitoring the distance between the laser radar sensor and the tip of the blade by horizontally emitting laser to the right front side (or left front side). The laser radar sensor does not need to extend out of the cabin and can be stably installed on the top of the cabin without the risk of falling during installation, and the detection angle of the laser radar sensor can be adjusted.

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

[0006] An online impeller imbalance monitoring device on the top of a cabin at least includes a monitoring device, wherein the monitoring device is a laser radar sensor, which is installed on the top of the cabin and the probe of the laser radar sensor faces the left or right side of the cabin. When the blades are rotated to the same side as the probe and the blades are horizontal, the direction of the probe points to the tip of the blade, thereby monitoring the distance between the tip of each blade and the laser radar sensor.

[0007] The laser radar sensor is connected to a data acquisition and processing unit, and the data acquisition and processing unit is connected to a host computer.

[0008] The laser radar sensor is installed on the top of the cabin through an adjustable mounting frame, which includes a base plate and a rotating vertical plate, wherein the base plate is fixed to the top of the cabin; the rotating vertical plate is perpendicular to the base plate, and one end of the rotating vertical plate is connected to the base plate so that the other end of the rotating vertical plate rotates around one end of the rotating vertical plate; the laser radar sensor is fixed to the other end of the rotating vertical plate and rotates with the rotating vertical plate so that the probe direction of the laser radar sensor points to the tip of the blade.

[0009] The other end of the rotating vertical plate is connected to a mounting vertical plate, and the mounting vertical plate and the rotating vertical plate together form a T-shaped structure, and the laser radar sensor is fixed on the mounting vertical plate.

[0010] A fixing pin is vertically fixed on the bottom plate, and one end of the rotating vertical plate is movably sleeved on the fixing pin, so that the rotating vertical plate rotates around the fixing pin.

[0011] An upper support plate is horizontally fixed on the fixing pin, and the upper support plate is located above the rotating vertical plate. An ear plate is horizontally fixed on the top of the rotating vertical plate, and a circular hole is arranged on the ear plate. An arc hole is arranged on the upper support plate with the fixing pin as the center of the circle, and the distance from the arc hole to the fixing pin is consistent with the distance from the circular hole to the fixing pin. Adjustment screws are connected to the arc hole and the circular hole, and the position of the rotating vertical plate is adjusted by moving the position of the adjustment screw on the arc hole.

[0012] A side support plate is fixed between the upper support plate and the bottom plate.

[0013] There are two side support plates, which are respectively located at the bottom of both sides of the upper support plate.

[0014] The central angle of the arc-shaped hole is 90°.

[0015] The upper support plate is provided with two groups of arc holes with the fixing pin as the center, and the ear plates are correspondingly provided with two groups. The distances from the two groups of arc holes to the fixing pins are respectively consistent with the distances from the round holes on the two groups of ear plates to the fixing pins. Two adjustment screws are correspondingly provided, and the two adjustment screws pass through the two groups of arc holes and the round holes respectively.

[0016] Compared with the prior art, the beneficial effects of the utility model are: 1. The online impeller imbalance monitoring device on the top of the cabin provided by the utility model installs the laser radar sensor on the top of the cabin, and there is no need to open a hole in the bottom of the cabin, so the installation is simple; and the laser radar sensor monitors the distance between it and the tip of the blade by emitting laser horizontally to the right front side (or left front side) to judge the balance of the impeller. The laser radar sensor does not need to extend out of the cabin and can be stably installed on the top of the cabin without the risk of falling during installation.

[0017] 2. In the utility model, the laser radar sensor is installed on the top of the cabin by adjusting the mounting frame, which is convenient for adjusting the installation angle of the laser radar sensor and facilitating the installation and debugging of the laser radar sensor.

[0018] 3. The adjustable mounting frame in the utility model includes components such as a base plate, a rotating vertical plate, a mounting vertical plate, an upper support plate and a side support plate. The components are firmly connected to each other, and the laser radar sensor is firmly connected to the adjustable mounting frame, which not only facilitates the angle adjustment of the laser radar sensor, but also ensures that the laser radar sensor always remains stable during the monitoring process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a top view of the lidar sensor installed on the wind turbine when the blades rotate to the same side as the probe and the blades are horizontal;

[0020] Figure 2 A schematic diagram of the layout of the online impeller imbalance monitoring device on the top of the nacelle provided by the utility model;

[0021] Figure 3 A monitoring flow chart of the online impeller imbalance monitoring device at the top of the nacelle provided by the utility model;

[0022] Figure 4 This is a schematic diagram of the connection between the laser radar sensor and the adjustment mounting frame in the utility model;

[0023] Figure 5 It is a schematic diagram of the connection between the rotating vertical plate and the installation vertical plate in the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the upper support plate in the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the side support plate in the utility model;

[0026] In the figure: 1-lidar sensor, 2-cabin, 3-blade, 4-data acquisition unit, 5-host computer, 61-bottom plate, 62-rotating vertical plate, 63-installing vertical plate, 64-upper support plate, 641-arc hole, 65-side support plate, 66-fixing pin, 67-ear plate, 671-circular hole. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0028] The online impeller imbalance monitoring device on the top of the nacelle provided by the utility model at least includes a monitoring device. In this embodiment, the monitoring device is a laser radar sensor 1, which is installed on the top of the nacelle 2, and the probe of the laser radar sensor faces the left or right side of the nacelle, so that the blade 3 rotates to the same side of the probe and the direction of the probe points to the tip of the blade when the blade is horizontal, thereby monitoring the distance between the tip of each blade and the laser radar sensor, such as Figure 1 shown. Figure 1 The probe of the laser radar sensor is facing the right side of the cabin (when the cabin faces the impeller). When the blade rotates to the right side of the cabin and the blade is horizontal, the probe direction of the laser radar sensor points to the tip of the blade.

[0029] In this embodiment, the laser radar sensor is connected to the data acquisition processing unit 4, which is connected to the host computer 5. The laser radar signal is connected to the data acquisition processing unit, which calculates the impeller imbalance of the fan with the measured distance data, and finally outputs the impeller imbalance to the host computer for monitoring and early warning. The layout diagram is shown in FIG. Figure 2 shown.

[0030] The monitoring flow chart of the online impeller imbalance monitoring device on the top of the cabin provided by the utility model is as follows Figure 3 As shown in the figure, it is assumed that the distance between the tip of the blade detected by the lidar sensor and the lidar sensor is S i (i is the blade number). Since the impeller aerodynamic imbalance will cause the blades to be subjected to different forces, resulting in different bending deformations. Therefore, by calculating the discrete degree of S1, S2, and S3, the blade impeller aerodynamic imbalance determination and monitoring can be performed. The discrete degree calculation method is:

[0031] σ=max(s1-ave(s1+s2+s3), s2-ave(s1+s2+s3), s3-ave(s1+s2+s3)) / L 叶片

[0032] In the above formula, L 叶片 is the length of the blade. If the discrete degree σ>1%, it means that the impeller is slightly unbalanced; if the discrete degree σ>3%, it means that the impeller is severely unbalanced; the upper computer calculates the discrete degree and makes a judgment and early warning, so as to monitor and warn the impeller imbalance, and carry out timely inspection and maintenance to ensure the safe and stable operation of the fan.

[0033] In actual installation, by knowing the fan impeller diameter d and the distance s between the lidar sensor probe and the impeller center, the angle of the lidar sensor probe toward the left or right side of the cabin can be calculated as θ = tan -1 (s / d), see Figure 1 However, during actual installation, the angle of the laser radar sensor probe toward the left or right side of the cabin may deviate from the theoretical value θ, so the direction of the laser radar sensor probe needs to be debugged on site. In order to facilitate the adjustment of the direction of the laser radar sensor probe, the laser radar sensor in this embodiment is installed on the top of the cabin by adjusting the mounting bracket.

[0034] In this embodiment, the adjustment mounting frame includes a bottom plate 61, a rotating vertical plate 62, a mounting vertical plate 63, an upper support plate 64 and a side support plate 65. Figure 4 As shown. The bottom plate is fixed to the top of the cabin. Specifically, bolt holes are provided around the bottom plate, and the bottom plate is fixedly connected to the top of the cabin by bolts. When there are no fixing holes on the top of the cabin, a clamp bracket can also be made on the top of the cabin to connect to the bottom plate. The rotating vertical plate is perpendicular to the bottom plate, and one end of the rotating vertical plate is connected to the bottom plate so that the other end of the rotating vertical plate rotates around one end of the rotating vertical plate. Specifically, a fixing pin 66 is vertically fixed on the bottom plate, and one end of the rotating vertical plate is movably sleeved on the fixing pin so that the rotating vertical plate rotates around the fixing pin. In this embodiment, the mounting vertical plate is connected to the other end of the rotating vertical plate, and the mounting vertical plate and the rotating vertical plate together form a T-shaped structure, such as Figure 5 As shown, the laser radar sensor is fixed against the mounting plate so that it rotates with the rotating plate, thereby adjusting the probe direction of the laser radar sensor to point to the tip of the blade.

[0035] In this embodiment, the upper support plate is horizontally fixed on the fixing pin and is located above the rotating vertical plate. Specifically, the upper support plate is a fan-shaped structure, such as Figure 6 As shown. An ear plate 67 is fixed horizontally on the top of the rotating vertical plate, and a circular hole 671 is arranged on the ear plate. Specifically, two groups of ear plates are fixed at intervals on the top of the rotating vertical plate, and each group of ear plates is symmetrically provided with two circular holes on both sides of the rotating vertical plate. Two groups of arc holes 641 are arranged on the upper support plate with the fixing pin as the center of the circle, and the distances from the two groups of arc holes to the fixing pin are respectively consistent with the distances from the circular holes on the two groups of ear plates to the fixing pin. Adjustment screws (not shown in the figure) are respectively connected to the two groups of arc holes and the circular holes. By moving the position of the adjustment screw on the arc hole, the position of the rotating vertical plate is adjusted. When the position of the rotating vertical plate is adjusted, the adjustment screw is locked to lock the position of the laser radar sensor. Furthermore, the central angle of the arc hole is 90°, supporting an adjustment range of 0-90°, and can be set as needed during actual setting.

[0036] The side support plate is fixed between the upper support plate and the bottom plate to ensure the stability of the upper support plate. Specifically, two side support plates are provided, which are respectively located at the bottom of both sides of the upper support plate. Furthermore, the side support plate is in a "["-shaped structure, such as Figure 7 As shown, the bottom and top of the side support plate are respectively fixed against the bottom plate and the upper support plate.

[0037] In the utility model, the balance of the impeller is judged by monitoring the distance between the laser radar sensor and the blade tip by horizontally emitting laser to the right front side (or left front side). The monitoring device has a simple structure, is easy to install, and has good installation stability.

Claims

1. An online impeller imbalance monitoring device at the top of a nacelle, comprising at least a monitoring device, characterized in that: The monitoring device is a lidar sensor, which is installed on the top of the cabin, and the probe of the lidar sensor is facing the left or right side of the cabin. When the blade is rotated to the same side as the probe and the blade is horizontal, the direction of the probe points to the tip of the blade, thereby monitoring the distance between the tip of each blade and the lidar sensor.

2. The online impeller imbalance monitoring device at the top of the nacelle according to claim 1 is characterized by: The laser radar sensor is connected to a data acquisition and processing unit, and the data acquisition and processing unit is connected to a host computer.

3. The online impeller imbalance monitoring device at the top of the nacelle according to claim 1 is characterized by: The laser radar sensor is installed on the top of the cabin through an adjustable mounting frame, which includes a base plate and a rotating vertical plate, wherein the base plate is fixed to the top of the cabin; the rotating vertical plate is perpendicular to the base plate, and one end of the rotating vertical plate is connected to the base plate so that the other end of the rotating vertical plate rotates around one end of the rotating vertical plate; the laser radar sensor is fixed to the other end of the rotating vertical plate and rotates with the rotating vertical plate so that the probe direction of the laser radar sensor points to the tip of the blade.

4. The online impeller imbalance monitoring device at the top of the nacelle according to claim 3 is characterized by: The other end of the rotating vertical plate is connected to a mounting vertical plate, and the mounting vertical plate and the rotating vertical plate together form a T-shaped structure, and the laser radar sensor is fixed on the mounting vertical plate.

5. The online impeller imbalance monitoring device at the top of the nacelle according to claim 3 is characterized by: A fixing pin is vertically fixed on the bottom plate, and one end of the rotating vertical plate is movably sleeved on the fixing pin, so that the rotating vertical plate rotates around the fixing pin.

6. The online impeller imbalance monitoring device at the top of the nacelle according to claim 5, characterized in that: An upper support plate is horizontally fixed on the fixing pin, and the upper support plate is located above the rotating vertical plate. An ear plate is horizontally fixed on the top of the rotating vertical plate, and a circular hole is arranged on the ear plate. An arc hole is arranged on the upper support plate with the fixing pin as the center of the circle, and the distance from the arc hole to the fixing pin is consistent with the distance from the circular hole to the fixing pin. Adjustment screws are connected to the arc hole and the circular hole, and the position of the rotating vertical plate is adjusted by moving the position of the adjustment screw on the arc hole.

7. The online impeller imbalance monitoring device at the top of the nacelle according to claim 6, characterized in that: A side support plate is fixed between the upper support plate and the bottom plate.

8. The online impeller imbalance monitoring device at the top of the nacelle according to claim 7, characterized in that: There are two side support plates, which are respectively located at the bottom of both sides of the upper support plate.

9. The online impeller imbalance monitoring device at the top of the nacelle according to claim 6, characterized in that: The central angle of the arc-shaped hole is 90°.

10. The online impeller imbalance monitoring device at the top of the nacelle according to claim 6, characterized in that: The upper support plate is provided with two groups of arc holes with the fixing pin as the center, and the ear plates are correspondingly provided with two groups. The distances from the two groups of arc holes to the fixing pins are respectively consistent with the distances from the round holes on the two groups of ear plates to the fixing pins. Two adjustment screws are correspondingly provided, and the two adjustment screws pass through the two groups of arc holes and the round holes respectively.

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