A dynamic stress testing device for a hydroelectric generating set speed control hydraulic system
Patent Information
- Application Number
- CN202522175096.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-15
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-10-15
AI Technical Summary
[0003]目前，在水电机组复杂恶劣的现场环境（如空间狭小）中实施动应力测试面临诸多挑战：传统的测试随意性比较强，通常都是临时性的，存在信号线拉扯导致信号中断或测量误差大，测量不稳定的问题
[0010]本实用新型的有益效果是：对电阻应变片传感器采用粘贴永久固定，并且应变片采用一组两个90度角布局，同步采集水平和垂直应变信号，采用高性能便携式采集设备，有效确保了在复杂厂房环境下应变信号传输的稳定性与测量数据的准确性。本实用新型操作性强，为水电机组调速液压系统的安全评估与故障诊断提供了一种高效、精准且可靠的实用化测试手段；可以为准确评估调速液压水电机组系统的机械状态与疲劳寿命提供了坚实的数据采集基础。
Smart Images
Figure CN224719551U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a dynamic stress testing device for a hydroelectric generator speed regulation hydraulic system. Background Technology
[0002] As the size and capacity of hydropower units continue to increase, the stability issues during their operation are becoming increasingly prominent. The speed-regulating hydraulic system of a hydropower unit, acting as the "nerve center" of the power station, subjects its core components, such as guide vane connecting rods, main pressure pumps, servo drives, and pressure oil pipes, to complex and alternating dynamic mechanical stresses during frequent start-ups, shutdowns, load adjustments, and load shedding. Under long-term operation, these dynamic stresses can easily lead to fatigue damage or even fracture of components, seriously threatening the safe and stable operation of the unit. Therefore, conducting on-site dynamic stress tests on key components of the speed-regulating hydraulic system to accurately obtain their true stress state is of paramount importance for assessing equipment health, predicting lifespan, optimizing control strategies, and preventing major accidents.
[0003] Currently, there are many challenges in conducting dynamic stress tests in the complex and harsh on-site environment of hydropower units (such as confined spaces): traditional tests are relatively arbitrary and usually temporary, and there are problems such as signal line pulling causing signal interruption or large measurement errors, and unstable measurements. Summary of the Invention
[0004] This invention provides a dynamic stress testing device for the speed regulation hydraulic system of a hydropower unit. By optimizing the arrangement of measuring points, permanently fixing the sensors by pasting, and using a set of two strain gauges arranged at a 90-degree angle, and employing a high-performance portable acquisition device, the device effectively ensures the stability of strain signal transmission and the accuracy of measurement data in complex factory environments.
[0005] To achieve the above objectives, the solution of this utility model is as follows: A dynamic stress testing device for a speed-regulating hydraulic system of a hydroelectric generator includes a strain gauge and a resistance strain gauge. The resistance strain gauge is rectangular and is installed on the pipelines, pump body, and base of the speed-regulating hydraulic system. The resistance strain gauges are arranged in pairs at a 90-degree angle on the pipelines, connecting rods, pump body, and base. One strain gauge in each pair is parallel to the axis of the object being measured, while the other is perpendicular to the axis of the object being measured. The resistance strain gauges are bonded to the surfaces of the pipelines, pump body, and base. Signal leads are welded to the signal leads of the resistance strain gauges, leading to the ground and then through pipelines to a signal test box. The strain gauge is housed in the signal test box, which has a signal input port. The strain gauge is connected to the signal input port, and the signal lead is also connected to the signal input port.
[0006] A further aspect of the solution is that the surfaces of the pipes, connecting rods, pump bodies, and bases that hold the resistance strain gauges are smooth planes with the surface coating removed, and the area of the smooth planes is at least 2 mm larger around the resistance strain gauges.
[0007] The solution is further as follows: the resistance strain gauge is a resistance strain gauge with model number BE120-5AA(11)-P300, the strain acquisition instrument is a SomatXR series data logger, and the strain acquisition instrument is connected to the signal input port through a channel selection switch to select and receive the signal from the resistance strain gauge.
[0008] A further aspect of the solution is that the resistance strain gauge is fixed to the pipeline, avoiding bends and interfaces, and the distance between the resistance strain gauge and the bends and interfaces is at least 50mm.
[0009] A further step in the solution is that the signal lead wire is fixed to the pipeline, connecting rod, pump body, and base by means of a sleeve, adhesive bonding, or binding.
[0010] The beneficial effects of this invention are as follows: The resistance strain gauge sensor is permanently fixed by adhesive bonding, and the strain gauges are arranged in a set of two 90-degree angles to simultaneously acquire horizontal and vertical strain signals. The use of high-performance portable acquisition equipment effectively ensures the stability of strain signal transmission and the accuracy of measurement data in complex factory environments. This invention is highly operable, providing an efficient, accurate, and reliable practical testing method for the safety assessment and fault diagnosis of hydraulic speed-regulating hydropower units; it also provides a solid data acquisition foundation for accurately assessing the mechanical condition and fatigue life of hydraulic speed-regulating hydropower unit systems.
[0011] The utility model will be further explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the resistance strain gauge layout in the connecting rod; Figure 3 This is a schematic diagram of the layout of the resistance strain gauges on the base; Figure 4 This is a schematic diagram of the layout of resistance strain gauges in the pump body. Figure 5 This is a schematic diagram of the layout of resistance strain gauges in the pipeline. Detailed Implementation
[0013] A dynamic stress testing device for a hydroelectric generator speed control hydraulic system, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the stress testing device includes a strain acquisition instrument 1 and a resistance strain gauge 2. The strain acquisition instrument 1 is fixed in a signal testing box 3. The resistance strain gauge is rectangular and is installed on the pipeline 5, connecting rod 6, pump body 7, and base 8 of the speed-regulating hydraulic system 4. The resistance strain gauges 2 are arranged in pairs at a 90-degree angle (the axes of the rectangular sections are at a 90-degree angle) on the pipeline 5, connecting rod 6, pump body 7, and base 8 to measure the horizontal and vertical strain of the pipeline, connecting rod, pump body, and base. Therefore, one strain gauge in each pair is parallel to the axis of the object being measured, while the other is perpendicular to the axis of the object being measured. The resistance strain gauges... The strain gauge is bonded and fixed to the surface of the pipeline, pump body, and base. The signal lead of the strain gauge is welded with a signal lead wire 9. The signal lead wire 9 is led to the ground and then to the signal test box 4 through the pipeline. The strain acquisition instrument 1 is set in the signal test box 4. The signal test box is equipped with a signal access port 101. The strain acquisition instrument is connected to the signal access port 101. The signal lead wire 9 is connected to the signal access port 101. The strain acquisition instrument 1 selects to receive the signal from the strain gauge 2 through the channel selection switch 102 connected to the signal access port 101. The channel selection switch 102 is an electronically controlled multiplexer, which is an IC analog switch circuit chip, such as the 74HC4067BQ 16-channel analog multiplexer. The acquisition instrument 1 is connected to the integrated circuit chip through the interface circuit. The IC analog switch circuit chip can be found in electronic application circuit assemblies, electronic application books, and the Internet, and will not be described in detail here.
[0014] For accurate signal: the surfaces of the pipes, connecting rods, pump bodies, and bases that hold the resistance strain gauges are smooth planes with the surface coating removed. In other words, before bonding and fixing, the surfaces of the pipes, connecting rods, pump bodies, and bases that hold the resistance strain gauges are cleaned to expose the main body. The area of the smooth plane is at least 2 mm larger than the area of the resistance strain gauge around its perimeter.
[0015] In the embodiment: the resistance strain gauge is a resistance strain gauge with model number BE120-5AA(11)-P300, and the strain acquisition instrument is a SomatXR series data logger. The strain acquisition instrument is connected to the signal input port through a channel selection switch to select and receive the signal from the resistance strain gauge.
[0016] Furthermore, to prevent bends and joints from affecting the accuracy of the test, the resistance strain gauge is fixed to the pipeline, avoiding bends and joints, and the distance between the resistance strain gauge and the bends and joints is at least 50mm.
[0017] In this embodiment, to protect the signal lead wire, the signal lead wire is fixed to the pipeline, connecting rod, pump body and base by means of sleeve bonding or binding.
[0018] The above-described embodiment of the dynamic stress testing device for the speed-regulating hydraulic system of a hydropower unit uses adhesive bonding to permanently fix the resistance strain gauge sensor. The strain gauges are arranged in a set of two 90-degree angles to simultaneously acquire horizontal and vertical strain signals. The use of high-performance portable acquisition equipment effectively ensures the stability of strain signal transmission and the accuracy of measurement data in complex plant environments. This invention is highly operable and provides an efficient, accurate, and reliable practical testing method for the safety assessment and fault diagnosis of speed-regulating hydraulic systems. It also provides a solid data acquisition foundation for accurately assessing the mechanical condition and fatigue life of the speed-regulating hydraulic system of a hydropower unit.
Claims
1. A dynamic stress testing device for a speed-regulating hydraulic system of a hydropower unit, comprising a strain gauge and a resistance strain gauge, wherein the resistance strain gauge is elongated rectangular and is disposed on the pipeline, pump body, and base of the speed-regulating hydraulic system, characterized in that, The resistance strain gauges are arranged in pairs at a 90-degree angle on the pipeline, connecting rod, pump body, and base. One strain gauge in each pair is parallel to the axis of the object being measured, while the other is perpendicular to the axis. The strain gauges are bonded to the surfaces of the pipeline, pump body, and base. Signal leads are welded to the signal leads of the strain gauges, which are led to the ground and then through pipelines to a signal test box. The strain acquisition instrument is located in the signal test box, which has a signal access port. The strain acquisition instrument is connected to the signal access port, and the signal leads are connected to the signal access port.
2. The dynamic stress testing device according to claim 1, characterized in that, The surfaces of the pipes, connecting rods, pump bodies, and bases that hold the resistance strain gauges are smooth planes with the surface coating removed, and the area of the smooth planes is at least 2 mm larger than the area of the resistance strain gauges.
3. The dynamic stress testing device according to claim 1, characterized in that, The resistance strain gauge is a BE120-5AA(11)-P300 resistance strain gauge, and the strain acquisition instrument is a SomatXR series data logger. The strain acquisition instrument connects to the signal input port through a channel selection switch to select and receive the signal from the resistance strain gauge.
4. The dynamic stress testing device according to claim 1, characterized in that, The resistance strain gauge is fixed on the pipeline, avoiding bends and interfaces, and the distance between the resistance strain gauge and the bends and interfaces is at least 50mm.
5. The dynamic stress testing device according to claim 1, characterized in that, The signal lead wires are fixed to the pipeline, connecting rod, pump body, and base by means of sleeve bonding or binding.