A rotary vane overspeed testing device

Abstract

The application relates to a rotary vane overspeed test device, which comprises a high-speed motor used for being connected with a fan impeller to be tested to drive the fan impeller to rotate during testing; a rotating mechanism comprising a rotating table connected with the high-speed motor; and a driving mechanism connected with the rotating mechanism and used for driving the rotating table to rotate to change the installation angle of the fan impeller and locking the installation angle during testing. The application has the effect that fan testing can be carried out at multiple installation angles.

Description

Technical Field

[0001] This application relates to the field of impeller testing technology, and in particular to a rotating blade overspeed testing device. Background Technology

[0002] Ventilation fans generally consist of an impeller, motor, guard, and control panel. Due to their compact structure and high efficiency, they are widely used in ventilation, refrigeration, and heat dissipation. As ventilation fans develop towards higher speeds, higher efficiency, higher static pressure, and lighter weight, the impeller, as a crucial rotating component, bears complex aerodynamic loads, gravity, and centrifugal loads during operation. If the impeller breaks or fails, it can lead to the failure of the entire device, causing significant economic losses. Therefore, it is necessary to conduct an overspeed test on the impeller before it leaves the factory. This involves running the impeller at high speed for a certain period and detecting any damage after the test, thereby assessing the impeller's operational stability and reliability.

[0003] In practical applications, impellers are typically installed at horizontal, inverted, lateral, or inclined angles. Existing testing devices only test one of these angles. When horizontally installed, the device is evacuated, ignoring the effect of gravity on the impeller. When the impeller is laterally or inclined, the stress at any point on a single blade changes with the rotation angle as it rotates from its lowest to its highest point. However, when the impeller is horizontally or inverted, the stress on a single blade does not change due to gravity because the direction of gravity coincides with the impeller's rotation axis. Stress is a crucial parameter for technicians to assess impeller strength, and different installation angles cause variations in blade stress. Therefore, existing overspeed testing devices that only consider a single impeller installation angle have limitations and require improvement. Utility Model Content

[0004] In view of this, this application provides a rotating blade overspeed testing device that can test different installation angles of wind turbine impellers.

[0005] The rotary blade overspeed testing device provided in this application adopts the following technical solution: A rotary blade overspeed testing device includes: a high-speed motor for connecting to a wind turbine impeller to be tested, so as to drive the wind turbine impeller to rotate during testing; a rotation mechanism including a rotary table connected to the high-speed motor; and a drive mechanism connected to the rotation mechanism for driving the rotary table to rotate to change the installation angle of the wind turbine impeller, and locking the installation angle during testing.

[0006] By adopting the above technical solution, the wind turbine impeller can be adjusted to different installation angles to simulate the stress changes of impeller overspeed operation under various installation angles, thus solving the limitation of existing test devices that can only test a single angle.

[0007] Preferably, the rotating mechanism includes two rotating shafts and two support frames. The two rotating shafts are connected to both ends of the platform along its length. The support frames include bearing seats, and the two bearing seats are respectively adapted to and connected to the two rotating shafts.

[0008] By adopting the above technical solution, the rotary table can drive the high-speed motor and the fan impeller to rotate 360 ​​degrees.

[0009] Preferably, the drive mechanism includes a fixed bracket, a drive motor, and a worm gear transmission box. The drive motor is connected to the worm gear transmission box, and the worm gear transmission box is connected to one of the rotating shafts. The drive motor and the worm gear transmission box are connected to the fixed bracket. The drive motor is used to drive the rotary table to rotate, and the worm gear transmission box is used to lock the angle of the rotary table.

[0010] By adopting the above technical solution, the rotary table can be driven to rotate and the installation angle of the fan impeller can be locked, thus ensuring stability during testing.

[0011] Preferably, it also includes a controller for controlling the start and stop of the high-speed motor and drive mechanism. The controller includes a display screen for inputting test parameters, including test speed, acceleration time, test time, and installation angle.

[0012] By adopting the above technical solution, the experiment can be started by directly inputting parameters through the display screen, which is convenient to operate.

[0013] Preferably, the device also includes a high-speed camera with its lens facing the wind turbine impeller to capture images during the test and transmit them to the display screen to view the starting position of the blade breakage.

[0014] By adopting the above technical solution, the impeller test process can be fully recorded, which makes it easier for technicians to identify the starting point of blade fracture during the experiment and facilitates subsequent improvements to the impeller structure.

[0015] Preferably, the device also includes a triaxial vibration sensor connected to the high-speed motor, used to sense the vibration acceleration of the fan impeller during the test and convert it into an electrical signal to be fed back to the controller.

[0016] By adopting the above technical solution, abnormal vibration signals when the impeller breaks or the balance weight falls off can be identified and fed back in a timely manner, eliminating the need for personnel to monitor the entire process and reducing human intervention.

[0017] Preferably, the device also includes a connector, which includes a first connecting portion and a second connecting portion. The first connecting portion is connected to the output shaft of the high-speed motor, and the second connecting portion includes a plurality of connecting slots, which are connected to the fan impeller.

[0018] By adopting the above technical solution, the connector is configured to connect to the high-speed motor and then to the fan impeller, which makes the connection convenient and avoids the problem of mismatch between the output shafts of different fans and high-speed motors.

[0019] Preferably, the second connecting portion includes three connecting pieces, each connecting piece including one connecting groove. The three connecting pieces are arranged circumferentially spaced along the first connecting portion. The three connecting grooves are connected to the impeller with test belt. The connecting grooves are strip-shaped holes and extend radially along the first connecting portion to adapt to connecting impellers of different diameters.

[0020] By adopting the above technical solution, the uniformity and stability of the force on the fan impeller connection can be improved, and it can be adapted to fan impellers of different diameters, with a wide range of applications.

[0021] Preferably, the test speed is 1-2 times the rated speed of the fan impeller, and the acceleration time is 1.5 times the time required for the fan to reach the rated speed after being powered on.

[0022] By adopting the above technical solution, the impeller of the wind turbine can be tested under test parameters that are larger than the rated parameters, which can better verify the quality of the wind turbine impeller.

[0023] Preferably, it also includes a protective mechanism, which includes a first guardrail and a second guardrail. The first guardrail and the second guardrail are located on opposite sides of the rotation table along its length. The high-speed motor, the rotation mechanism, and the impeller of the fan to be tested are located between the first guardrail and the second guardrail. The protective mechanism includes a sensor switch, which is connected to the controller and is used to sense the closing and opening status of the first guardrail and the second guardrail.

[0024] By adopting the above technical solution, protective mechanisms are configured to provide protection during the test, so as to avoid risks to personal safety.

[0025] The rotary blade overspeed testing device provided in this application solves the problem that existing testing schemes have a single impeller installation angle and cannot truly simulate the complex installation angles in actual impeller applications. By rotating the test platform, the impeller can be installed at any angle, resulting in better testing effects and a wider range of applications. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of a rotary blade overspeed testing device provided in an embodiment of this application.

[0027] Figure 2 This is a partial schematic diagram of the rotary table provided in the embodiments of this application.

[0028] Figure 3 This is a partial schematic diagram of the rotating shaft provided in an embodiment of this application.

[0029] Figure 4 This is a schematic diagram of the connection between the connector and the fan impeller provided in the embodiments of this application.

[0030] Figure 5 This is a top view schematic diagram of a rotary blade overspeed testing device provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. High-speed motor; 11. Connector; 111. First connecting part; 112. Second connecting part; 113. Connecting groove; 2. Rotating mechanism; 21. Rotating table; 211. Mounting block; 212. Mounting groove; 22. Rotating shaft; 221. Rotating shaft; 222. T-block; 23. Support frame; 231. Bearing seat; 3. Drive mechanism; 31. Drive motor; 32. Worm gear transmission box; 331. First fixed bracket; 332. Second fixed bracket; 4. Fan impeller; 5. Equipment cabinet; 6. Display screen; 7. High-speed camera; 8. Protective mechanism; 81. First guardrail; 82. Second guardrail; 83. Third guardrail; 841. Inductive switch; 842. Inductive plate. Detailed Implementation

[0032] To better understand the purpose, technical solutions, and advantages of this application, it has been described and illustrated below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that this application can be implemented without these details. In some cases, to avoid obscuring various aspects of this application due to unnecessary description, well-known methods, processes, systems, components, and / or circuits already described at a higher level will not be elaborated upon. It will be apparent to those skilled in the art that various modifications can be made to the embodiments disclosed in this application, and the general principles defined in this application can be applied to other embodiments and application scenarios without departing from the principles and scope of this application. Therefore, this application is not limited to the illustrated embodiments, but conforms to the broadest scope consistent with the scope of protection claimed in this application.

[0033] It should be noted that the descriptions of these embodiments are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples.

[0036] This application discloses a rotary blade overspeed testing device.

[0037] like Figure 1 As shown, the rotary blade overspeed testing device includes a high-speed motor 1, a rotating mechanism 2, and a drive mechanism 3. The high-speed motor 1 is connected to the wind turbine impeller 4 to be tested, so as to drive the wind turbine impeller 4 to rotate during the test. The rotating mechanism 2 includes a rotatable rotary table 21, through which the high-speed motor 1 is mounted. The drive mechanism 3 is connected to the rotating mechanism 2, and is used to drive the rotary table 21 to rotate to change the installation angle of the wind turbine impeller 4, and lock the installation angle during the test so that the wind turbine impeller 4 is tested at a stable angle, ensuring the accuracy of the test.

[0038] This application mounts a high-speed motor 1 on a rotatable rotary table 21 and drives the rotary table 21 to rotate via a drive mechanism 3, thereby enabling the testing of the wind turbine impeller 4 at different installation angles. This allows for the simulation of stress changes during impeller overspeed operation at various installation angles, overcoming the limitation of existing testing devices that can only test a single angle. It comprehensively evaluates the impact of gravity on blade stress changes, improves the diversity and accuracy of impeller strength testing, and provides better testing results with a wider range of applications.

[0039] like Figure 1As shown, the rotating mechanism 2 includes two support frames 23. The rotating platform 21 is a rectangular flat plate with two rotating shafts 22 symmetrically arranged at both ends along its length. The two support frames 23 are symmetrically located at both ends along the length of the rotating platform 21. The bottom of the support frames 23 can be connected to the ground via expansion bolts to improve stability. A mounting hole for a bearing seat 231 is provided near the top of the support frame 23. The bearing seat 231 includes a bearing and a retaining ring. The two rotating shafts 22 are respectively connected to the corresponding bearing seats 231, thereby enabling the rotating platform 21 to rotate 360°. Figure 2 and Figure 3 As shown, the end of the rotary table 21 along its length is provided with two mounting blocks 211, and a mounting groove 212 is provided between the two mounting blocks 211. The rotating shaft 22 includes a rotating shaft 221 and a T-block 222. After the rotating shaft 221 and the T-block 222 are welded together, the rotating shaft 221 is inserted into the mounting groove 212 through the T-block 222 and then connected to the rotary table 21 by bolts. The rotating shaft 22 and the rotary table 21 are set separately, which is convenient for processing. The two rotating shafts 22 are positioned through the mounting groove 212 to ensure coaxiality and improve the smoothness of rotation.

[0040] like Figure 1 As shown, the drive mechanism 3 includes a fixed bracket, a drive motor 31, and a worm gear transmission box 32. The fixed bracket includes a first fixed bracket 331 and a second fixed bracket 332. The first fixed bracket 331 is used to mount the drive motor 31, and the second fixed bracket 332 is used to mount the worm gear transmission box 32. The first fixed bracket 331 and the second fixed bracket 332 are bolted to the equipment cabinet 5, and the equipment cabinet 5 is fixed to the ground by bolts. This helps to reduce the vibration amplitude of the drive motor 31 and the worm gear transmission box 32 and improve stability. The output shaft of the drive motor 31 is connected to the input shaft of the worm gear transmission box 32 through a coupling. The output shaft of the worm gear transmission box 32 is connected to one of the rotating shafts 22 of the rotary table 21 through a coupling. The drive motor 31 is used to drive the rotary table 21 to rotate, and the worm gear transmission box 32 is used to lock the angle of the rotary table 21. When the drive motor 31 starts, the worm gear transmission box 32 transmits torque to the rotating shaft 22 of the rotary table 21, driving the rotary table 21 to rotate. The worm in the worm gear transmission box 32 can only drive the worm gear, and the worm gear cannot drive the worm to rotate. Therefore, the drive motor 31 can effectively transmit power to the rotary table 21 through the worm gear transmission box 32. When the drive motor 31 does not drive the rotary table 21, the rotary table 21 cannot rotate under the action of gravity, thus locking the test angle. The drive motor 31 can drive in both directions to achieve installation in various orientations.

[0041] In other embodiments, the drive mechanism 3 includes a multi-stroke cylinder (not shown in the figure). The telescopic shaft of the multi-stroke cylinder is connected to one of the two sides of the rotary table 21 along its length. Different strokes are selected to drive the cylinder according to the requirements of the test angle, causing the rotary table 21 to rotate. After the cylinder telescopic shaft extends according to its stroke, it locks, thereby locking the test angle. In addition, by connecting the multi-stroke cylinder to different side plates, the fan impeller 4 can be installed inverted or on the side.

[0042] like Figure 1 As shown, the testing device also includes a controller, which controls the start and stop of the high-speed motor 1 and the drive mechanism 3. The controller is installed on the equipment cabinet 5 and has a display screen 6. The display screen 6 can input test parameters, including the test speed N, the acceleration time T1 for the high-speed motor 1 to accelerate from 0 rpm to the test speed N, the test time T2 for the high-speed motor 1 to maintain the speed N, and the angle between the rotating table 21 and the horizontal support, i.e., the installation angle α. Among these, the test speed N can be 1-2 times the rated speed of the fan impeller 4, for example, 1.5 times; the acceleration time T1 can be 1.5 times the time required for the fan to reach the rated speed after being powered on. For example, if the time required for the fan to reach the rated speed after being powered on is 6 seconds, then the acceleration time T1 is 9 seconds. The test time T2 can be set according to the company's inspection standards, for example, 15 minutes. The installation angle α can be 0 degrees for horizontal installation, 30 degrees, 45 degrees, 60 degrees, etc. for inclined installation, and 90 degrees for side installation, etc. Each test parameter can be set to be greater than the rated parameters of the fan impeller 4 according to the inspection standard. If the fan impeller 4 does not break or other phenomena when tested under larger parameters, it can be considered as having passed the test.

[0043] During the test, the installation angle α input via display screen 6 drives the output shaft of motor 31 to rotate a certain number of revolutions n. Through a coupling and worm gear transmission, the rotary table 21 achieves precise rotation angle α. Display screen 6 is connected to the speed control signal line of high-speed motor 1. Based on the input control voltage signal v, high-speed motor 1 rotates its output shaft to the test speed N. The controller controls the rate of change of the input voltage v of high-speed motor 1 based on the input acceleration time T1, thus controlling the time it takes for high-speed motor 1 to accelerate from 0 rpm to the test speed N. Once the controller detects that high-speed motor 1 has reached the test speed N, it starts timing. After the test time T2 is reached, the controller disconnects the input voltage of high-speed motor 1, causing the impeller to stop rotating naturally, thus ending the test. The entire testing process requires no manual monitoring or intervention, reducing labor costs and minimizing personal safety hazards.

[0044] Existing technologies cannot determine the initial location of impeller fracture during testing. Technicians must rely on extensive experience to improve the structure of the fractured impeller, which is difficult to operate in practice and requires highly experienced personnel. This application also installs a high-speed camera 7 on the equipment cabinet 5. The high-speed camera 7 is connected to the controller to capture images during the test and transmit them to the display screen 6 to view the initial location of blade fracture in the fan impeller 4. Figure 1 As shown, the lens of the high-speed camera 7 is pointed towards the wind turbine impeller 4 to record the entire test process in real time. When the blade breaks, the video can be saved for the test personnel to slow down the video and see the starting position of the blade breakage, so as to clarify the direction for the subsequent improvement of the impeller structure and effectively shorten the research and development cycle.

[0045] like Figure 1 As shown, a triaxial vibration sensor 12 is installed on the high-speed motor 1 to sense the vibration acceleration of the fan impeller 4 during the test and convert it into an electrical signal to be fed back to the controller. The triaxial vibration sensor 12 and the high-speed motor 1 can be connected by screws, glue, magnetism, etc. The controller monitors the dynamic changes of the motor's vibration acceleration amplitude in real time through the triaxial vibration sensor 12. When the high-speed motor 1 reaches the test speed N, it monitors and records the average vibration acceleration amplitude a (the amplitude A changes dynamically over time, and the average value is taken as a). When the blade breaks or the balance weight flies off, the blade balance is disrupted, and the vibration acceleration amplitude A increases sharply. The controller determines that A is greater than a certain threshold, such as 1.5a, and the duration reaches a certain time, such as 5s. It then controls the high-speed motor 1 to stop and issues an alarm sound to alert the experimenters. By comparing the signal from the triaxial vibration sensor 12 with the set threshold, abnormal vibration signals when the impeller breaks or the balance weight falls off can be identified, allowing for timely automatic shutdown and alarm control. The operation is simple, requiring no personnel to monitor the entire process, no manual intervention, and reducing costs.

[0046] Please refer to Figure 4The high-speed motor 1 and the impeller under test are connected via connector 11. Connector 11 includes a first connecting part 111 and a second connecting part 112. The first connecting part 111 is a round shaft, which is connected to the output shaft of the high-speed motor 1 via a keyway to transmit power. The end face of the output shaft of the high-speed motor 1 has a threaded hole, and the end of the first connecting part 111 is connected to the threaded hole by a fastening bolt. The thread direction of the threaded hole is opposite to the rotation direction of the impeller to prevent loosening during rotation. The second connecting part 112 includes multiple connecting slots 113, which are connected to the impeller 4. The number of connecting slots 113 matches the number of connecting holes on the impeller to ensure correct connection and good coaxiality. By providing multiple connecting slots 113, it is easy to connect to the connecting holes on the impeller via bolts. In this embodiment, the second connecting part 112 includes three connecting pieces, each with a connecting groove 113. The three connecting pieces are evenly spaced circumferentially along the first connecting part 111. The three connecting grooves 113 are strip-shaped holes and extend radially along the first connecting part 111. The length of the connecting groove 113 can be greater than 10cm to facilitate connection with impellers of different diameters. The width is equal to the diameter of the impeller connection hole, which can prevent shaking during the test. By setting three connecting grooves 113 and evenly circumferentially arranging them, the uniformity and stability of the connection with the fan impeller 4 are improved, avoiding uneven connection positions from affecting the test results. Furthermore, the elongated shape of the three connecting grooves 113 allows the mounting holes of impellers of different diameters to be adapted to the connecting grooves 113, improving the adaptability of the test device.

[0047] Please refer to Figure 5The testing apparatus also includes a protective mechanism 8, which comprises a first guardrail 81, a second guardrail 82, and a third guardrail 83. The first guardrail 81 and the second guardrail 82 are slidably disposed on both sides of the rotating platform 21 along its length. The third guardrail 83 is located at the end of the rotating platform 21 away from the drive mechanism 3 and on the outside of the support frame 23. The high-speed motor 1, the rotating mechanism 2, and the impeller 4 to be tested are located between the first guardrail 81, the second guardrail 82, and the third guardrail 83. The bottom of the first guardrail 81 and the second guardrail 82 can be connected to pulleys, and a slide rail is provided on the ground. The sliding of the first guardrail 81 and the second guardrail 82 is achieved through the connection between the pulleys and the slide rail, thereby opening or closing the testing area and preventing personnel from entering the testing area during the overspeed test, thus avoiding personal safety risks. The protective mechanism 8 includes a sensor switch 841, which can be installed on the side of the equipment cabinet 5 facing the drive mechanism 3. The sensor switch 841 is connected to the controller via a signal line. The first guardrail 81 and the second guardrail 82 are provided with corresponding sensor plates 842, which can sense the closed and open status of the first guardrail 81 and the second guardrail 82. When the sensor plate 842 enters the sensing position of the sensor switch 841, it is considered that the first guardrail 81 and the second guardrail 82 are closed. When the sensor plate 842 leaves the sensing position of the sensor switch 841, it is considered that the first guardrail 81 and the second guardrail 82 are open. When the first guardrail 81 and the second guardrail 82 are sensed to be in the open state, the controller issues a warning through the display screen 6 and prohibits or stops the test.

[0048] The steps for using the experimental apparatus provided in this application are as follows: Prepare the wind turbine impeller 4 to be tested and perform a visual inspection; Determine the test rotational speed N, acceleration time T1, test time T2, and impeller installation angle α; Connect connector 11 to high-speed motor 1, and install the impeller onto connector 11, ensuring that the bolts and screws are securely connected; Input test parameters via the display; Click the start button to begin the test. Rotary table 21 rotates by an angle α, and fan impeller 4 begins to accelerate to the test speed N. The test operation time T2 is then stopped. When an impeller breaks or a counterweight falls off, an abnormal vibration signal is detected. The controller brakes the motor, stops the impeller from rotating, and the display automatically saves the test process video for easy viewing. The impeller was removed for inspection, and the test was completed.

[0049] It should be understood that although the steps in the flowcharts in the accompanying drawings are shown sequentially as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise expressly stated herein, there is no strict order in which these steps are performed, and they may be performed in other orders.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rotary blade overspeed testing device, characterized in that, include: A high-speed motor (1) is used to connect to the impeller (4) of the fan to be tested, so as to drive the impeller (4) to rotate during the test; The rotating mechanism (2) includes a rotating table (21) connected to the high-speed motor (1); The drive mechanism (3) is connected to the rotating mechanism (2) and is used to drive the rotary table (21) to rotate to change the installation angle of the fan impeller (4) and lock the installation angle during testing.

2. The rotary blade overspeed testing device according to claim 1, characterized in that: The rotating mechanism (2) includes two rotating shafts (22) and two support frames (23). The two rotating shafts (22) are connected to the two ends of the rotating table (21) along the length direction. The support frame (23) includes bearing seats (231). The two bearing seats (231) are respectively adapted to and connected to the two rotating shafts (22).

3. The rotary blade overspeed testing device according to claim 2, characterized in that: The drive mechanism (3) includes a fixed bracket, a drive motor (31) and a worm gear transmission box (32). The drive motor (31) is connected to the worm gear transmission box (32), and the worm gear transmission box (32) is connected to one of the rotating shafts (22). The drive motor (31) and the worm gear transmission box (32) are connected to the fixed bracket. The drive motor (31) is used to drive the rotary table (21) to rotate, and the worm gear transmission box (32) is used to lock the angle of the rotary table (21).

4. The rotary blade overspeed testing device according to claim 1, characterized in that: It also includes a controller for controlling the start and stop of the high-speed motor (1) and the drive mechanism (3). The controller includes a display screen (6) for inputting test parameters, including test speed, acceleration time, test time and installation angle.

5. The rotary blade overspeed testing device according to claim 4, characterized in that: It also includes a high-speed camera (7) with its lens facing the wind turbine impeller (4) to capture images during the test and transmit them to the display screen (6) to see the starting position of the blade breakage.

6. The rotary blade overspeed testing device according to claim 4, characterized in that: It also includes a triaxial vibration sensor (12), which is connected to the high-speed motor (1) and is used to sense the vibration acceleration of the fan impeller (4) during the test and convert it into an electrical signal to be fed back to the controller.

7. The rotary blade overspeed testing device according to claim 4, characterized in that: It also includes a connector (11), which includes a first connecting part (111) and a second connecting part (112). The first connecting part (111) is connected to the output shaft of the high-speed motor (1), and the second connecting part (112) includes a plurality of connecting slots (113), which are connected to the fan impeller (4).

8. The rotary blade overspeed testing device according to claim 7, characterized in that: The second connecting part (112) includes three connecting pieces, each connecting piece including a connecting groove (113). The three connecting pieces are arranged circumferentially at intervals along the first connecting part (111). The three connecting grooves (113) are connected to the fan impeller (4). The connecting grooves (113) are in the shape of strip holes and extend radially along the first connecting part (111) to adapt to connecting impellers of different diameters.

9. The rotary blade overspeed testing device according to claim 4, characterized in that: The test speed is 1-2 times the rated speed of the fan impeller (4), and the acceleration time is 1.5 times the time required for the fan to reach the rated speed after being powered on.

10. The rotary blade overspeed testing device according to any one of claims 4-9, characterized in that: It also includes a protective mechanism (8), which includes a first guardrail (81) and a second guardrail (82). The first guardrail (81) and the second guardrail (82) are located on both sides of the rotation table (21) along its length. The high-speed motor (1), the rotation mechanism (2), and the fan impeller (4) to be tested are located between the first guardrail (81) and the second guardrail (82). The protective mechanism (8) includes a sensor switch (841), which is connected to the controller and is used to sense the closing and opening status of the first guardrail (81) and the second guardrail (82).

Images