A hydroelectric generator set dynamic balance test teaching platform

Abstract

The utility model provides a kind of water-turbine generator set dynamic balance test teaching platform, including the upper rack and lower rack of arrangement of upper and lower structure, the lower rack and the upper rack are correspondingly provided with lower accommodating cavity and upper accommodating cavity in, the main shaft is passed in the upper accommodating cavity and the lower accommodating cavity, the main shaft is provided with the power component with frequency conversion function in lower accommodating cavity one end, the main shaft is towards the circumferential side of upper accommodating cavity inner portion and is equipped with rotor, the stator is set to the upper accommodating cavity side wall corresponding rotor position, the main shaft is provided with upper fixed component in power component one end, the upper rack is towards the lower rack one end and is provided with middle fixed component. The utility model is by the main shaft and rotor driven by power component transmission control between upper rack and lower rack, cooperate and set stator component in upper accommodating cavity to realize water-turbine generator set rotor dynamic balance simulation, facilitate the routine teaching use of staff.

Description

Technical Field

[0001] This utility model relates to the field of hydro-generator maintenance technology, and in particular to a teaching platform for dynamic balancing tests of hydro-generators. Background Technology

[0002] The dynamic balancing test of the turbine generator rotor is a critical step in the unit's maintenance. This test plays a vital role in ensuring the safe and stable operation of the unit after maintenance. However, because this test is only conducted during unit maintenance, it is difficult to realistically simulate in daily teaching or training. Consequently, related training is often limited to theoretical instruction, resulting in relatively insufficient practical skills among frontline production staff. Therefore, there is an urgent need to develop a dynamic balancing test teaching platform for turbine generator units. This platform would meet the practical training needs of frontline hydropower plant employees for dynamic balancing tests, continuously improve their technical skills, and ensure the safe and stable operation of the hydropower units. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] To achieve the above objectives, this utility model proposes a dynamic balancing test teaching platform for a hydro-generator set, comprising an upper frame and a lower frame arranged in an upper and lower structure. A lower receiving cavity and an upper receiving cavity are correspondingly arranged within the lower frame and the upper frame, respectively. A main shaft is installed through the upper and lower receiving cavities. A power component with frequency conversion function is installed at the end of the main shaft facing the lower receiving cavity. A rotor is sleeved on the periphery of the portion of the main shaft facing the upper receiving cavity. A stator is installed on the sidewall of the upper receiving cavity corresponding to the rotor position. An upper fixing component is installed at the end of the main shaft away from the power component, and a middle fixing component is installed at the end of the upper frame facing the lower frame.

[0005] This invention achieves dynamic balance simulation of the turbine generator rotor by arranging a main shaft and rotor controlled by a power component between the upper and lower frames, and cooperating with the stator assembly set in the upper cavity, which facilitates daily teaching use by staff.

[0006] Optionally, the power assembly includes a variable frequency motor, a coupling, and a flywheel;

[0007] The flywheel, the coupling, and the variable frequency motor are sequentially fixedly connected to the end of the main shaft facing the lower receiving cavity.

[0008] Furthermore, the variable frequency motor uses AC power, and the specifications of the variable frequency motor are set to three-phase 380V, 50Hz or single-phase 220V, 50Hz.

[0009] The frequency fluctuation range of the variable frequency motor is set to ±0.2Hz;

[0010] The voltage fluctuation range of the variable frequency motor is set to ±5%;

[0011] The speed range of the variable frequency motor is set to 0-300 r / min.

[0012] Furthermore, the upper fixing assembly includes a first fixing plate disposed on the side of the upper frame away from the lower frame, the first fixing plate being provided with a first clearance hole for the spindle to pass through, and an upper guide bearing sleeved on the outside of the spindle being disposed in the first clearance hole.

[0013] Furthermore, the upper frame includes a main body section corresponding to the rotor portion and a transition section near the lower frame, and the inner diameter of the transition section corresponding to the upper receiving cavity is smaller than the inner diameter of the main body section corresponding to the upper receiving cavity.

[0014] The central fixing assembly includes a second fixing plate disposed on the end face of the transition section facing the main body section and a third fixing plate disposed on the transition section facing the lower frame;

[0015] The second fixed plate is provided with a second clearance hole for the main shaft to pass through, and a thrust bearing sleeved on the outside of the main shaft is provided in the second clearance hole;

[0016] The third fixing plate is provided with a third clearance hole for the main shaft to pass through, and a lower guide bearing sleeved on the outside of the main shaft is provided in the third clearance hole.

[0017] Furthermore, vibration sensors are installed on both the upper and lower frames to detect vibrations, and the vibration sensors are electrically connected to a controller for data analysis.

[0018] Furthermore, at least two swing sensors are provided at the upper guide bearing, the lower guide bearing, and the thrust bearing, and the swing sensors are electrically connected to the controller.

[0019] Furthermore, both the lower guide bearing and the upper guide bearing employ a segmented tile structure, and the single-sided gap of the tile is controlled within 0.5mm.

[0020] Furthermore, the vertical deviation of the spindle axis is ≤0.10mm.

[0021] Furthermore, a surrounding ladder is provided on the outside of the lower frame, and the height of the surrounding ladder is not higher than the height of the lower frame.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0024] Figure 1 This is a structural schematic diagram of a dynamic balancing test teaching platform for a hydro-generator set according to the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Upper frame; 11. Upper receiving cavity; 12. Main body section; 13. Transition section; 2. Lower frame; 21. Lower receiving cavity; 3. Main shaft; 31. Rotor; 32. Stator; 4. Power assembly; 41. Variable frequency motor; 42. Coupling; 43. Flywheel; 5. Upper fixing assembly; 51. First fixing plate; 52. First clearance hole; 53. Upper guide bearing; 6. Middle fixing assembly; 61. Second fixing plate; 62. Third fixing plate; 63. Second clearance hole; 64. Thrust bearing; 65. Third clearance hole; 66. Lower guide bearing; 7. Vibration sensor; 8. Swing sensor; 9. Enclosure ladder. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0028] A teaching platform for dynamic balancing tests of hydro-generator units, as described below. Figure 1 Please provide a detailed explanation.

[0029] A dynamic balancing test teaching platform for a hydro-generator set includes an upper frame 1 and a lower frame 2 arranged in an upper and lower structure. A lower receiving cavity 21 and an upper receiving cavity 11 are respectively arranged in the lower frame 2 and the upper frame 1. A main shaft 3 is installed through the upper receiving cavity 11 and the lower receiving cavity 21. A power component 4 with frequency conversion function is installed at the end of the main shaft 3 facing the lower receiving cavity 21. A rotor 31 is sleeved on the periphery of the part of the main shaft 3 facing the upper receiving cavity 11. A stator 32 is installed on the side wall of the upper receiving cavity 11 at the position corresponding to the rotor 31. An upper fixing component 5 is installed at the end of the main shaft 3 away from the power component 4. A middle fixing component 6 is installed at the end of the upper frame 1 facing the lower frame 2.

[0030] This invention achieves dynamic balance simulation of the rotor 31 of a hydro-generator unit by arranging a main shaft 3 and a rotor 31 controlled by a power component 4 between the upper frame 1 and the lower frame 2, in conjunction with a stator 32 assembly set in the upper receiving cavity 11. When a dynamic balance test of the hydro-generator is required, the staff can control the rotor 31 to simulate the rotation under different conditions by controlling the power component 4 to provide different power environments. This allows for the simulation of the dynamic balance state of the rotor 31 under various conditions during non-maintenance periods, providing practical learning opportunities for frontline staff and facilitating daily teaching.

[0031] In some embodiments, the power assembly 4 includes a variable frequency motor 41, a coupling 42, and a flywheel 43; the flywheel 43, the coupling 42, and the variable frequency motor 41 are sequentially fixedly connected to one end of the main shaft 3 facing the lower receiving cavity 21.

[0032] In some embodiments, the variable frequency motor 41 uses AC power, and the specifications of the variable frequency motor 41 are set to three-phase 380V, 50Hz or single-phase 220V, 50Hz.

[0033] The frequency fluctuation range of the variable frequency motor 41 is set to ±0.2Hz;

[0034] The voltage fluctuation range of the variable frequency motor 41 is set to ±5%;

[0035] The speed range of the variable frequency motor 41 is set to 0-300 r / min.

[0036] The variable frequency motor 41 can be used to control the speed of the main shaft 3. The variable frequency motor 41 has an external interface for outputting and inputting data information. By connecting a control terminal to the external interface, the frequency converter in the variable frequency motor 41 can be controlled, thereby simulating the dynamic process of the variable speed of the hydro-generator unit. The control terminal can be a computer terminal, mobile device terminal, or other terminal device that can input, output, and edit data.

[0037] In some embodiments, the upper fixing assembly 5 includes a first fixing plate 51 disposed on the side of the upper frame 1 opposite to the lower frame 2. The first fixing plate 51 is provided with a first clearance hole 52 for the spindle 3 to pass through, and an upper guide bearing 53 sleeved on the outside of the spindle 3 is disposed in the first clearance hole 52. The upper guide bearing 53 can fix the spindle 3 and reduce the friction between the spindle 3 and the first fixing plate 51. The upper guide bearing 53 adopts a cylindrical bearing structure.

[0038] In some embodiments, the upper frame 1 includes a main body section 12 corresponding to the rotor 31 and a transition section 13 near the lower frame 2, and the inner diameter of the upper receiving cavity 11 corresponding to the transition section 13 is smaller than the inner diameter of the upper receiving cavity 11 corresponding to the main body section 12.

[0039] The middle fixing component 6 includes a second fixing plate 61 disposed on the end face of the transition section 13 facing the main body section 12 and a third fixing plate 62 disposed on the transition section 13 facing the lower frame 2;

[0040] The second fixed plate 61 is provided with a second clearance hole 63 for the main shaft 3 to pass through. A thrust bearing 64 sleeved on the outside of the main shaft 3 is provided in the second clearance hole 63. The thrust bearing 64 is fixedly installed by a rigid support structure of support bolts. In one specific embodiment, there are 8 support bolts. The force on the thrust bearing 64 can be adjusted by these 8 support bolts to achieve the effect of simulating a real machine.

[0041] The third fixing plate 62 is provided with a third clearance hole 65 for the main spindle 3 to pass through, and a lower guide bearing 66 is sleeved on the outside of the main spindle 3 inside the third clearance hole 65. The lower guide bearing 66 can fix the main spindle 3 and reduce the friction between the main spindle 3 and the third fixing plate 62. The lower guide bearing 66 adopts a cylindrical bearing structure.

[0042] In some embodiments, vibration sensors 7 are installed on both the upper frame 1 and the lower frame 2 to detect the vibration of the upper frame 1 and the lower frame 2. The vibration sensors 7 are electrically connected to a controller for data analysis. The vibration sensors 7 can acquire real-time data on the vibration changes of the upper frame 1 and the lower frame 2 during frequency conversion, thereby realizing real-time monitoring of the vibration. The controller can be installed on the upper frame 1, the lower frame 2, or independently. The specific location of the controller is arranged according to the actual test conditions. The controller and the vibration sensors 7 can be connected via wired or wireless data connection. When using wireless data connection, a communication unit needs to be set between the controller and the vibration sensors 7. The communication unit can be a Bluetooth unit or a WiFi unit.

[0043] In some embodiments, at least two swing sensors 8 are provided at the upper guide bearing 53, the lower guide bearing 66, and the thrust bearing 64, and the swing sensors 8 are electrically connected to the controller. The swing controller can monitor the swing amplitude of the upper guide bearing 53, the lower guide bearing 66, and the thrust bearing 64 in real time, and then transmit the obtained data to the controller for analysis and processing.

[0044] After acquiring the collected vibration and oscillation data, the controller accurately locates the imbalance point using the amplitude four-circle graph method and decomposes the counterweight using the vector decomposition method. Based on the decomposition results, staff can simulate the adjustment of the counterweight on the teaching platform to solve the vibration problem caused by the mass imbalance of rotor 31.

[0045] In some embodiments, the tiles of both the lower guide bearing 66 and the upper guide bearing 53 adopt a segmented tile structure, and the single-sided gap of the tiles is controlled within 0.5mm.

[0046] In some embodiments, the vertical deviation of the spindle 3 axis is ≤0.10mm. This ensures that the entire device operates in a relatively stable state and avoids loss of control during operation due to large vertical deviations of the axis.

[0047] In some embodiments, a ladder 9 is provided on the outside of the lower frame 2, and the height of the ladder 9 is not higher than the height of the lower frame 2. This facilitates the operation and adjustment of components such as the rotor 31, stator 32, oscillation sensor 8, and vibration sensor 7 inside the upper machine body by the operator.

[0048] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. 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 suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A dynamic balancing test teaching platform for hydro-generator sets, characterized in that, The device includes an upper frame and a lower frame arranged vertically. The lower frame and the upper frame are respectively provided with a lower receiving cavity and an upper receiving cavity. A main shaft is installed through the upper receiving cavity and the lower receiving cavity. A power component with frequency conversion function is provided at the end of the main shaft facing the lower receiving cavity. A rotor is sleeved on the periphery of the part of the main shaft facing the upper receiving cavity. A stator is provided on the side wall of the upper receiving cavity at the position corresponding to the rotor. An upper fixing component is provided at the end of the main shaft away from the power component. A middle fixing component is provided at the end of the upper frame facing the lower frame.

2. The hydro-generator dynamic balancing test teaching platform as described in claim 1, characterized in that, The power assembly includes a variable frequency motor, a coupling, and a flywheel; The flywheel, the coupling, and the variable frequency motor are sequentially fixedly connected to the end of the main shaft facing the lower receiving cavity.

3. The hydro-generator dynamic balancing test teaching platform as described in claim 2, characterized in that, The variable frequency motor uses AC power, and the specifications of the variable frequency motor are set as three-phase 380V, 50Hz or single-phase 220V, 50Hz. The frequency fluctuation range of the variable frequency motor is set to ±0.2Hz; The voltage fluctuation range of the variable frequency motor is set to ±5%; The speed range of the variable frequency motor is set to 0-300 r / min.

4. The hydro-generator dynamic balancing test teaching platform as described in claim 1, characterized in that, The upper fixing assembly includes a first fixing plate disposed on the side of the upper frame away from the lower frame. The first fixing plate is provided with a first clearance hole for the spindle to pass through, and an upper guide bearing sleeved on the outside of the spindle is disposed in the first clearance hole.

5. The hydro-generator dynamic balancing test teaching platform as described in claim 4, characterized in that, The upper frame includes a main body section corresponding to the rotor and a transition section near the lower frame. The inner diameter of the transition section corresponding to the upper receiving cavity is smaller than the inner diameter of the main body section corresponding to the upper receiving cavity. The central fixing assembly includes a second fixing plate disposed on the end face of the transition section facing the main body section and a third fixing plate disposed on the transition section facing the lower frame; The second fixed plate is provided with a second clearance hole for the main shaft to pass through, and a thrust bearing sleeved on the outside of the main shaft is provided in the second clearance hole; The third fixing plate is provided with a third clearance hole for the main shaft to pass through, and a lower guide bearing sleeved on the outside of the main shaft is provided in the third clearance hole.

6. The hydro-generator dynamic balancing test teaching platform as described in claim 5, characterized in that, Vibration sensors are installed on both the upper and lower frames to detect vibrations, and the vibration sensors are electrically connected to a controller for data analysis.

7. The hydro-generator dynamic balancing test teaching platform as described in claim 6, characterized in that, At least two swing sensors are provided at the upper guide bearing, the lower guide bearing, and the thrust bearing, and the swing sensors are electrically connected to the controller.

8. The hydro-generator dynamic balancing test teaching platform as described in claim 5, characterized in that, Both the lower guide bearing and the upper guide bearing use a segmented tile structure, and the single-sided gap of the tile is controlled within 0.5mm.

9. The hydro-generator dynamic balancing test teaching platform as described in claim 1, characterized in that, The vertical deviation of the spindle axis is ≤0.10mm.

10. The hydro-generator dynamic balancing test teaching platform as described in claim 1, characterized in that, An enclosure ladder is provided on the outside of the lower frame, and the height of the enclosure ladder is not higher than the height of the lower frame.

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