Hydro-generator unit vibration frequency measuring device and measuring method

Abstract

The present disclosure relates to a kind of water turbine generator set vibration frequency measuring device and measuring method, the water turbine generator set vibration frequency measuring device includes upper rack, horizontal vibration frequency measuring mechanism and vertical vibration frequency measuring mechanism, upper rack is used to be connected with water turbine generator set, horizontal vibration frequency measuring mechanism is arranged on upper rack, horizontal vibration frequency measuring mechanism is used to measure the horizontal vibration frequency of upper rack, to indirectly measure the horizontal vibration frequency of water turbine generator set, vertical vibration frequency measuring mechanism is arranged with upper rack interval, vertical vibration frequency measuring mechanism is used to measure the vertical vibration frequency of upper rack, to indirectly measure the vertical vibration frequency of water turbine generator set.The present disclosure can effectively obtain the direct influence of vibration frequency on water turbine generator set by measuring the horizontal vibration frequency and vertical vibration frequency of water turbine generator set, so as to accurately find out the reason of unit vibration, provide basis for solving unit vibration problem.

Description

Technical Field

[0001] This disclosure relates to the field of vibration frequency measurement technology, specifically to a vibration frequency measurement device and method for a hydro-generator set. Background Technology

[0002] Studying the natural vibration characteristics of important components of hydroelectric generator sets is fundamental to the study of vibration problems. Vibration frequency analysis of key components not only helps in the diagnosis of unit vibration faults, but also prevents resonance phenomena, which is of great significance for ensuring the safe and stable operation of the unit.

[0003] Currently, power plants generally use oscillation online monitoring technology to measure the vibration and sway of the units. However, the existing technology is complex and each unit needs to be equipped with an online device, which is too costly. Considering all factors, some small hydropower units have not installed oscillation online monitoring devices, and the vibration of the units cannot be effectively monitored.

[0004] How to simplify the collection of vibration measurement data of on-site water turbine units and accurately identify the cause of unit vibration is an urgent technical problem to be solved. Summary of the Invention

[0005] The purpose of this disclosure is to provide a vibration frequency measuring device and method for a hydro-generator set. By measuring the horizontal and vertical vibration frequencies of the hydro-generator set, this disclosure can effectively obtain the direct impact of the vibration frequency on the hydro-generator set, thereby accurately identifying the cause of the unit's vibration and providing a basis for solving the unit's vibration problem.

[0006] To achieve the above objectives, this disclosure provides a vibration frequency measuring device for a hydro-generator set, comprising an upper frame, a horizontal vibration frequency measuring mechanism, and a vertical vibration frequency measuring mechanism. The upper frame is used to connect to the hydro-generator set. The horizontal vibration frequency measuring mechanism is disposed on the upper frame and is used to measure the horizontal vibration frequency of the upper frame, thereby indirectly measuring the horizontal vibration frequency of the hydro-generator set. The vertical vibration frequency measuring mechanism is arranged at an interval from the upper frame and is used to measure the vertical vibration frequency of the upper frame, thereby indirectly measuring the vertical vibration frequency of the hydro-generator set.

[0007] Optionally, the vertical vibration frequency measuring mechanism includes a moving trolley, a measuring rod, and a vertical displacement sensor. The moving trolley is equipped with a position adjustment component and is used to move around the upper frame. The measuring rod is horizontally mounted on the position adjustment component and has a slide rail extending along the axial direction of the measuring rod. The vertical displacement sensor is slidably mounted on the slide rail.

[0008] Optionally, the position adjustment component includes a telescopic shaft and a cantilever beam. The telescopic shaft is vertically mounted on the moving trolley. One end of the cantilever beam is rotatably connected to the telescopic section of the telescopic shaft, and the other end is a free end. The measuring rod is horizontally mounted on the free end.

[0009] Optionally, the cantilever beam is perpendicular to the telescopic shaft, and the measuring rod is perpendicular to the cantilever beam.

[0010] Optionally, an electromagnet is provided at the bottom of the mobile trolley, which generates electromagnetic fields when energized, so that the mobile trolley can be attracted to the metal ground.

[0011] Optionally, the horizontal vibration frequency measuring mechanism includes a support plate and multiple horizontal displacement sensors. The support plate is horizontally mounted on the upper frame, and the multiple horizontal displacement sensors are mounted on the support plate.

[0012] Optionally, the support plate includes a first annular frame and a second annular frame arranged coaxially. The outer diameter of the second annular frame is smaller than the inner diameter of the first annular frame. The first annular frame and the second annular frame are connected by a plurality of support arms. The plurality of support arms are radially and evenly distributed between the first annular frame and the second annular frame with the axis of the second annular frame as the center.

[0013] Optionally, multiple horizontal displacement sensors are concentrated and evenly distributed on one of the support arms and / or multiple horizontal displacement sensors are evenly distributed on a quarter section of the second annular frame.

[0014] Optionally, the vibration frequency measuring device of the hydro-generator set further includes a controller, which is communicatively connected to the vertical displacement sensor and the horizontal displacement sensor respectively. The controller is used to acquire the measurement data of the vertical displacement sensor and the horizontal displacement sensor and perform modal analysis.

[0015] This disclosure also provides a method for measuring the vibration frequency of a hydro-generator set, using the aforementioned hydro-generator set vibration frequency measuring equipment, the method comprising:

[0016] Connect the upper frame to the hydro-generator set;

[0017] The horizontal vibration frequency measuring mechanism is horizontally mounted on the upper frame to measure the horizontal vibration frequency of the hydro-generator unit.

[0018] The vertical vibration frequency measuring mechanism is brought close to the upper frame to measure the vertical vibration frequency of the hydro-generator unit.

[0019] Through the above technical solution, this disclosure can effectively obtain the direct impact of vibration frequency on the hydro-generator unit by measuring the horizontal and vertical vibration frequencies of the hydro-generator unit, thereby accurately identifying the cause of the unit's vibration and providing a basis for solving the unit's vibration problem.

[0020] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a hydro-generator vibration frequency measuring device provided in an exemplary embodiment of the present disclosure;

[0023] Figure 2 This is a side view of a mobile vehicle provided in an exemplary embodiment of this disclosure;

[0024] Figure 3 This is a top view of a support plate provided in an exemplary embodiment of this disclosure;

[0025] Figure 4 This is a flowchart of a method for measuring the vibration frequency of a hydro-generator set according to an exemplary embodiment of this disclosure.

[0026] Explanation of reference numerals in the attached figures

[0027] 1- Mounting on rack;

[0028] 2-Mobile cart;

[0029] 3-Measuring rod;

[0030] 4-Vertical displacement sensor;

[0031] 5-Telescopic shaft;

[0032] 6-Cantilever beam;

[0033] 7-Electromagnet;

[0034] 8-Horizontal displacement sensor;

[0035] 9-First ring frame;

[0036] 10 - Second ring frame;

[0037] 11-outrigger. Detailed Implementation

[0038] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0039] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" are generally used to define the orientation of the accompanying drawings, and "inner" and "outer" refer to the inner and outer parts of the relevant components. Furthermore, terms such as "first" and "second" are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0041] like Figures 1 to 3 As shown, the first aspect of this disclosure provides a vibration frequency measuring device for a hydro-generator set, including an upper frame 1, a horizontal vibration frequency measuring mechanism, and a vertical vibration frequency measuring mechanism. The upper frame 1 is used to connect to the hydro-generator set. The horizontal vibration frequency measuring mechanism is disposed on the upper frame 1 and is used to measure the horizontal vibration frequency of the upper frame 1 to indirectly measure the horizontal vibration frequency of the hydro-generator set. The vertical vibration frequency measuring mechanism is arranged at intervals from the upper frame 1 and is used to measure the vertical vibration frequency of the upper frame 1 to indirectly measure the vertical vibration frequency of the hydro-generator set.

[0042] The vibration frequency measuring device for hydro-generator units disclosed herein can effectively obtain the direct impact of vibration frequency on hydro-generator units by measuring the horizontal and vertical vibration frequencies of the hydro-generator units, thereby accurately identifying the cause of unit vibration and providing a basis for solving unit vibration problems.

[0043] Optionally, the vertical vibration frequency measuring mechanism includes a moving trolley 2, a measuring rod 3, and a vertical displacement sensor 4. The moving trolley 2 is equipped with a position adjustment component and is used to move around the upper frame 1. The measuring rod 3 is horizontally set on the position adjustment component and is provided with a slide rail extending along the axial direction of the measuring rod 3. The vertical displacement sensor 4 is slidably set on the slide rail.

[0044] Among them, the position adjustment component can adjust the position of the measuring rod 3, and the vertical displacement sensor 4 can reciprocate along the guide direction of the slide rail.

[0045] The above-disclosed hydro-generator vibration frequency measuring device, through the combination of the moving trolley 2, the position adjustment component and the measuring rod 3, can change the position of the vertical displacement sensor 4, thereby measuring the vertical displacement at different measurement positions of the hydro-generator and obtaining the vertical vibration frequency at different measurement positions of the hydro-generator, so as to more intuitively reflect the vertical vibration of the hydro-generator under different operating conditions and at different measurement positions.

[0046] Optionally, the position adjustment component includes a telescopic shaft 5 and a cantilever beam 6. The telescopic shaft 5 is vertically mounted on the moving trolley 2. One end of the cantilever beam 6 is rotatably connected to the telescopic section of the telescopic shaft 5, and the other end is a free end. The measuring rod 3 is horizontally mounted at the free end.

[0047] Through the above technical solution, the telescopic shaft 5 can move up and down vertically on the mobile trolley 2, adjusting the overall height of the vertical vibration frequency measuring mechanism to adapt to the height of the upper frame 1, the actual factory conditions, and to change the position of the vertical displacement sensor 4 in the vertical direction. The cantilever beam 6 can change the position of the vertical displacement sensor 4 in the horizontal direction during rotation, and the free end can be adapted to the position of the measured point.

[0048] In one exemplary embodiment of this disclosure, the measuring rod 3 is movably connected to the cantilever beam 6, which can change the position of the connection point between the measuring rod 3 and the cantilever beam 6, thereby enabling the measuring rod 3 to move in the horizontal direction to adjust the position of the measuring rod 3.

[0049] Optionally, the cantilever beam 6 is perpendicular to the telescopic shaft 5, and the measuring rod 3 is perpendicular to the cantilever beam 6.

[0050] Through the above technical solution, the vertical displacement sensor 4 can move at any position in space, thereby measuring the vertical displacement at different measurement positions of the hydro-generator unit, and then obtaining the vertical vibration frequency at different measurement positions of the hydro-generator unit.

[0051] Optionally, an electromagnet 7 is provided at the bottom of the mobile trolley 2. The electromagnet 7 is used to generate electromagnetic fields after being energized, so that the mobile trolley 2 can be attracted to the metal ground.

[0052] The ground in the operating area of ​​the above-mentioned hydro-generator vibration frequency measuring equipment disclosed herein is a metal ground.

[0053] Through the above technical solution, the electromagnet 7 can generate electromagnetic fields after being energized, so as to make the mobile trolley 2 adhere to the metal ground, thereby fixing the mobile trolley 2 and providing a stable measurement environment.

[0054] In one exemplary embodiment of this disclosure, the mobile trolley 2 is equipped with wheels at its bottom, enabling it to move within the work area and adapting to various terrain conditions.

[0055] Optionally, the horizontal vibration frequency measuring mechanism includes a support plate and multiple horizontal displacement sensors 8. The support plate is horizontally mounted on the upper frame 1, and the multiple horizontal displacement sensors 8 are mounted on the support plate.

[0056] Through the above technical solution, the horizontal displacement sensor 8 can measure the horizontal displacement of the hydro-generator unit, and then obtain the horizontal vibration frequency of the hydro-generator unit, so as to more intuitively reflect the horizontal vibration of the hydro-generator unit.

[0057] Optionally, the support plate includes a first annular frame 9 and a second annular frame 10 arranged coaxially. The outer diameter of the second annular frame 10 is smaller than the inner diameter of the first annular frame 9. The first annular frame 9 and the second annular frame 10 are connected by a plurality of support arms 11. The plurality of support arms 11 are radially and evenly distributed between the first annular frame 9 and the second annular frame 10 with the axis of the second annular frame 10 as the center.

[0058] Through the above technical solution, the structure of the support plate can withstand the vibration and stress from the hydro-generator unit and provide support and protection for the horizontal displacement sensor 8.

[0059] In one exemplary embodiment of this disclosure, the number of support arms 11 is eight, and the eight support arms 11 are arranged symmetrically.

[0060] In one exemplary embodiment of this disclosure, the support plate is fixedly connected to the upper frame 1 by bolts.

[0061] Optionally, multiple horizontal displacement sensors 8 are concentrated and evenly distributed on one of the support arms 11 and / or multiple horizontal displacement sensors 8 are evenly distributed on a quarter section of the second annular frame 10.

[0062] Through the above technical solution, multiple horizontal displacement sensors 8 are concentrated and evenly distributed in a certain area of ​​the support plate, which can increase the installation density of horizontal displacement sensors 8 in a certain area of ​​the support plate and improve measurement accuracy. Compared with multiple horizontal displacement sensors 8 scattered on the support plate, multiple horizontal displacement sensors 8 are concentrated and evenly distributed in a certain area of ​​the support plate, which can reduce the number of horizontal displacement sensors 8 as much as possible while meeting the measurement accuracy requirements.

[0063] In one exemplary embodiment of this disclosure, there are twelve horizontal displacement sensors 8, of which eight horizontal displacement sensors 8 are evenly distributed on one of the support arms 11, and the remaining four horizontal displacement sensors 8 are evenly distributed on a quarter section of the second annular frame 10 or a quarter section of the first annular frame 9.

[0064] Optionally, the vibration frequency measurement device for the hydro-generator set also includes a controller, which is communicatively connected to the vertical displacement sensor 4 and the horizontal displacement sensor 8, respectively. The controller is used to acquire the measurement data of the vertical displacement sensor 4 and the horizontal displacement sensor 8 and perform modal analysis.

[0065] Through the above technical solution, the controller can acquire the vertical displacement measurement data of the vertical displacement sensor 4 and the horizontal displacement measurement data of the horizontal displacement sensor 8 and perform modal analysis to establish horizontal and vertical vibration frequency models under different working conditions. This allows for different measures to be taken to address the impact and faults caused by the vibration of the hydro-generator unit under different working conditions, thereby reducing the harm and impact caused by the vibration of the hydro-generator unit, improving the stability of the hydro-generator unit, and ensuring the safe and stable operation of the hydro-generator unit.

[0066] A second aspect of this disclosure provides a method for measuring the vibration frequency of a hydro-generator set, using the aforementioned hydro-generator set vibration frequency measuring equipment, the method comprising:

[0067] Connect the upper frame 1 to the hydro-generator set.

[0068] The horizontal vibration frequency measuring mechanism is horizontally set on the upper frame 1 to measure the horizontal vibration frequency of the hydro-generator unit.

[0069] The vertical vibration frequency measuring mechanism is brought close to the upper frame 1 to measure the vertical vibration frequency of the hydro-generator unit.

[0070] Among them, such as Figure 4 As shown, the method for measuring the vibration frequency of this hydro-generator unit specifically includes the following steps:

[0071] Connect the upper frame 1 to the hydro-generator set.

[0072] The support plate is horizontally installed on the upper frame 1 so that the horizontal displacement sensor 8 on the support plate can measure the horizontal displacement of the hydro-generator unit.

[0073] Move the trolley 2 close to the upper frame 1, and adjust the telescopic shaft 5, cantilever beam 6 and measuring rod 3 accordingly. Slide the vertical displacement sensor 4 to measure the vertical displacement of the hydro-generator unit.

[0074] The controller acquires the vertical displacement measurement data from the vertical displacement sensor 4 and the horizontal displacement measurement data from the horizontal displacement sensor 8, and performs modal analysis to establish horizontal and vertical vibration frequency models under different working conditions.

[0075] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0076] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0077] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A hydroelectric generator set vibration frequency measuring device, characterized by, The utility model relates to a water turbine generator set vibration frequency measuring device, including: upper frame for being connected with water turbine generator set; Horizontal vibration frequency measuring mechanism is arranged on the upper frame, and the horizontal vibration frequency measuring mechanism is used for measuring the horizontal vibration frequency of the upper frame to indirectly measure the horizontal vibration frequency of the water turbine generator set; Vertical vibration frequency measuring mechanism is arranged at intervals with the upper frame, and the vertical vibration frequency measuring mechanism is used for measuring the vertical vibration frequency of the upper frame to indirectly measure the vertical vibration frequency of the water turbine generator set; The vertical vibration frequency measuring mechanism includes: Movable trolley is installed with position adjusting part on the upper, and the movable trolley is used for moving around the upper frame; Measuring rod is horizontally arranged on the position adjusting part, and the measuring rod is provided with sliding rail extending along the axial direction of the measuring rod; Vertical displacement sensor is slidably arranged on the sliding rail.

2. The hydroelectric generator set vibration frequency measuring device according to claim 1, characterized in that, The position adjusting part includes: Telescopic shaft is vertically arranged on the movable trolley; Cantilever beam is rotatably connected with the telescopic section of telescopic shaft at one end, and the other end is free end, and the measuring rod is horizontally arranged on the free end.

3. The hydroelectric generator set vibration frequency measuring device according to claim 2, characterized in that, The cantilever beam is perpendicular to the telescopic shaft, and the measuring rod is perpendicular to the cantilever beam.

4. The hydroelectric generator set vibration frequency measuring device according to claim 1, characterized by The bottom of the movable trolley is provided with an electromagnet, and the electromagnet is used to generate electromagnetism after electrification to make the movable trolley adsorb on the metal ground.

5. The hydroelectric generator set vibration frequency measuring device according to claim 1, characterized by The horizontal vibration frequency measuring mechanism includes: Support disc is horizontally arranged on the upper frame; Multiple horizontal displacement sensors are arranged on the support disc.

6. The hydroelectric generator set vibration frequency measuring device according to claim 5, characterized in that The support disc includes coaxially arranged first annular frame and second annular frame, the outer diameter of the second annular frame is less than the inner diameter of the first annular frame, and the first annular frame and the second annular frame are connected by multiple supporting arms, and multiple supporting arms are evenly distributed between the first annular frame and the second annular frame with the axis of the second annular frame as the center.

7. The hydroelectric generator set vibration frequency measuring device according to claim 6, characterized in that Multiple horizontal displacement sensors are evenly distributed on one of the supporting arms and / or multiple horizontal displacement sensors are evenly distributed on a quarter of the second annular frame.

8. The hydroelectric generator set vibration frequency measuring device according to claim 5, characterized by The water turbine generator set vibration frequency measuring device further includes a controller in communication with the vertical displacement sensor and the horizontal displacement sensor, the controller is used to obtain the measurement data of the vertical displacement sensor and the horizontal displacement sensor and perform modal analysis.

9. A method of measuring the frequency of vibrations of a hydroelectric generator set, characterized in that, The water turbine generator set vibration frequency measuring device of any one of claims 1-8 is used, and the method includes: Connecting the upper frame with the water turbine generator set; The horizontal vibration frequency measuring mechanism is horizontally arranged on the upper frame to measure the horizontal vibration frequency of the water turbine generator set; The vertical vibration frequency measuring mechanism is arranged close to the upper frame to measure the vertical vibration frequency of the water turbine generator set.

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