Water turbine runner vibration mode testing device

Abstract

The utility model relates to the technical field of water turbine runner detection, in particular to a water turbine runner vibration mode testing device which is non-contact and anti-interference. Comprising a non-contact sensor assembly, a signal acquisition and processing module, a fixed installation mechanism and a signal shielding structure. The signal acquisition and processing module is electrically connected with the non-contact sensor assembly, the fixed mounting mechanism is used for mounting the non-contact sensor assembly and the signal acquisition and processing module at proper positions near a turbine runner, and the signal shielding structure is arranged outside the non-contact sensor assembly and the signal acquisition and processing module.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water turbine runner detection, in particular to a water turbine runner vibration mode testing device. BACKGROUND

[0002] As the core equipment in the hydroelectric power system, the operation state of the water turbine directly affects the power generation efficiency and equipment safety. During the long-term operation of the water turbine runner, vibration phenomena are prone to occur due to factors such as water flow impact, mechanical stress, and material fatigue. The monitoring and analysis of vibration signals are of great significance for evaluating the operation state of the water turbine runner, predicting faults, and preventing accidents.

[0003] The existing vibration mode testing device is mainly composed of a sensor, a data acquisition system, and data analysis software. During testing, direct contact with the runner is required, which not only affects the operation of the equipment due to installation and removal, but also causes measurement errors due to mechanical wear and corrosion. At the same time, the water turbine operates in a complex environment with electromagnetic interference, water flow impact, and other factors, which easily interfere with the sensor signal, leading to increased measurement errors and making it impossible to accurately obtain the vibration mode information of the runner. SUMMARY

[0004] To solve the above technical problems, the utility model provides a non-contact and anti-interference water turbine runner vibration mode testing device.

[0005] The water turbine runner vibration mode testing device of the utility model comprises a non-contact sensor assembly, a signal acquisition and processing module, a fixed installation mechanism, and a signal shielding structure. The signal acquisition and processing module is electrically connected to the non-contact sensor assembly. The fixed installation mechanism is used to install the non-contact sensor assembly and the signal acquisition and processing module at a suitable position near the water turbine runner. The signal shielding structure is arranged outside the non-contact sensor assembly and the signal acquisition and processing module.

[0006] Further, the non-contact sensor assembly comprises a plurality of laser Doppler vibration sensors, which are distributed and arranged.

[0007] Further, the laser Doppler vibration sensor is installed on the fixed installation mechanism through an adjusting bracket. The adjusting bracket comprises a base, an extendable support rod, and an angle adjusting piece. One end of the extendable support rod is connected to the base, and the other end is connected to the laser Doppler vibration sensor through the angle adjusting piece.

[0008] Further, the signal acquisition and processing module comprises a signal conditioning circuit, a data acquisition card, and a microprocessor. The signal conditioning circuit is connected to the non-contact sensor assembly. The data acquisition card is connected to the signal conditioning circuit. The microprocessor is connected to the data acquisition card.

[0009] Further, the signal acquisition and processing module further comprises a wireless transmission module, which is connected with the microprocessor.

[0010] Further, the fixed mounting mechanism comprises a mounting frame and a plurality of adsorptive fixing members, the mounting frame is in a frame structure, and the adsorptive fixing members are arranged on the mounting frame.

[0011] Further, the signal shielding structure comprises a shielding shell and a shielding lining, the shielding shell is made of metal material and completely wraps the non-contact sensor assembly and the signal acquisition and processing module, and the shielding lining is made of conductive rubber material and arranged inside the shielding shell.

[0012] Further, a signal leading hole is arranged on the shielding shell, and a shielding joint is arranged at the signal leading hole.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] By adopting the non-contact sensor assembly, direct contact with the rotating wheel is avoided, the influence of installation and dismounting on equipment operation is reduced, measurement error caused by mechanical wear and corrosion is also avoided, and the accuracy of measurement results is ensured; the signal shielding structure can effectively shield external factors such as electromagnetic interference, the stability of sensor signals is ensured, and the measurement precision is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model will be further described below in combination with the drawings.

[0016] Figure 1 It is the structural schematic diagram of the utility model;

[0017] Figure 2 It is the structural schematic diagram of the non-contact sensor assembly of the utility model;

[0018] Figure 3 It is Figure 2 The sectional enlarged structural schematic diagram of part A in the figure;

[0019] Figure 4 It is the structural schematic diagram of the signal acquisition and processing module of the utility model;

[0020] Marked in the drawing: 1, non-contact sensor assembly; 11, laser Doppler vibration sensor; 12, adjusting support; 121, base; 122, telescopic support rod; 123, angle adjusting piece; 2, signal acquisition and processing module; 21, signal conditioning circuit; 22, data acquisition card; 23, microprocessor; 24, wireless transmission module; 3, fixed mounting mechanism; 31, mounting frame; 32, adsorptive fixing piece; 4, signal shielding structure; 41, shielding shell; 411, signal leading hole; 412, shielding joint; 42, shielding lining. DETAILED DESCRIPTION

[0021] The specific embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0022] As Figures 1 to 4 shown, a water turbine runner vibration modal testing device of the utility model, including non-contact sensor assembly 1, signal acquisition and processing module 2, fixed mounting mechanism 3 and signal shielding structure 4;Non-contact sensor assembly 1 through optical, electromagnetic induction or other non-contact technology, real-time capture the vibration signal generated in the running process of runner, without direct contact with runner;Signal acquisition and processing module 2 and non-contact sensor assembly 1 electricity, for receiving, collecting and preliminary processing vibration signal;Fixed mounting mechanism 3 is used for installing non-contact sensor assembly 1 and signal acquisition and processing module 2 in the runner near the appropriate position of water turbine, signal shielding structure 4 is arranged in non-contact sensor assembly 1 and signal acquisition and processing module 2 outside, for reducing the influence of external interference on signal;Through the synergistic effect of non-contact sensor assembly 1, signal acquisition and processing module 2, fixed mounting mechanism 3 and signal shielding structure 4, provide reliable technical support for the operation state evaluation and fault prediction of water turbine runner.

[0023] In some embodiments of the present application, the non-contact sensor assembly 1 comprises a plurality of laser Doppler vibration sensors 11 distributedly arranged; the laser Doppler vibration sensor 11 works based on the Doppler effect, irradiates the surface of the runner by emitting a laser beam, receives the reflected light and analyzes the frequency change thereof, so as to obtain the speed or displacement information of the vibration of the runner; through the layout design of the distributed arrangement, different areas of the runner can be covered, the overall vibration mode of the runner can be monitored in all directions, and the omission of information caused by the limited measurement range of a single sensor can be avoided; at the same time, the multi-sensor cooperative work can capture the multi-order vibration modes of the runner under complex working conditions, such as bending mode and torsional mode, and through the fusion analysis of the multi-path signals, the accuracy and reliability of the vibration mode recognition can be significantly improved; in addition, the distributed layout can also enhance the positioning ability of the device to local faults, when the runner blade has cracks, imbalance or other abnormalities, the vibration signals of different sensors are compared, the fault area is quickly identified, and accurate diagnostic basis is provided.

[0024] In some embodiments of the present application, the laser Doppler vibration sensor 11 is installed on the fixed mounting mechanism 3 through the adjusting support 12, the adjusting support 12 comprises a base 121, an extendable support rod 122 and an angle adjusting piece 123, which are used to adjust the height and detection angle of the laser Doppler vibration sensor 11, so as to ensure that the sensor can adapt to the test requirements of different types of water turbines and maintain the best measurement state under the complex operating environment of the water turbine; the base 121 is fixedly installed on the fixed mounting mechanism 3 and plays a supporting and fixing role; one end of the extendable support rod 122 is connected with the base 121, and the other end is connected with the laser Doppler vibration sensor 11 through the angle adjusting piece 123; the extendable support rod 122 controls the extension length of the support rod through electric drive or manual knob control, and the angle adjusting piece 123 adjusts the angle through the rotary joint and the locking mechanism, so as to ensure that the laser beam can irradiate the surface of the runner at the best angle.

[0025] In some embodiments of the present application, the signal acquisition and processing module 2 comprises a signal conditioning circuit 21, a data acquisition card 22 and a microprocessor 23; the signal conditioning circuit 21 is connected with the non-contact sensor assembly 1, and is used to amplify and filter the collected vibration signals; the data acquisition card 22 is connected with the signal conditioning circuit 21, and is used to convert the analog signals into digital signals; the microprocessor 23 is connected with the data acquisition card 22, and is used to preliminarily analyze and process the digital signals; the modular division of labor and the optimization of functions can realize the efficient acquisition and accurate processing of the vibration signals of the water turbine runner, and at the same time, the strong anti-interference ability and high reliability can be achieved, so as to improve the overall performance of the test device.

[0026] The signal acquisition and processing module 2 further comprises a wireless transmission module 24 connected with the microprocessor 23, for wirelessly transmitting the vibration signals after preliminary processing to an external data analysis terminal.

[0027] In some embodiments of the present application, the fixed mounting mechanism 3 comprises a mounting frame 31 and a plurality of adsorptive fixing members 32, the mounting frame 31 is in a frame structure, and the adsorptive fixing members 32 are distributed on the mounting frame 31 and used for adsorptively fixing the mounting frame 31 on a metal component near the runner of the hydraulic turbine; the adsorptive fixing member is an electromagnetic suction cup, the electromagnetic suction cup is connected with an external power supply through a control switch, and the adsorption and release of the electromagnetic suction cup are controlled through the control switch, so that the quick mounting and dismounting of the testing device are realized, and the deployment process of the device is simplified.

[0028] In some embodiments of the present application, the signal shielding structure 4 comprises a shielding outer shell 41 and a shielding inner liner 42; the shielding outer shell 41 is made of metal material, is made of high-conductivity metal material such as aluminum, copper or stainless steel, completely wraps the non-contact sensor assembly 1 and the signal acquisition and processing module 2, and forms a first electromagnetic protection barrier; the shielding inner liner 42 is made of conductive rubber material, is arranged inside the shielding outer shell 41, provides further electromagnetic shielding and buffer protection between the shielding outer shell 41 and the internal equipment, and further enhances the shielding effect; through the synergistic effect of the shielding outer shell 41 and the shielding inner liner 42, the influence of external electromagnetic interference on vibration signal acquisition and data processing is multiple-isolated, at the same time, the internal elements are protected from vibration, impact and moisture and other environmental factors in complex working conditions, so that the signal acquisition accuracy, equipment stability and service life of the testing device are improved.

[0029] The shielding outer shell 41 is provided with a signal leading-out hole 411, and a shielding connector 412 is arranged at the signal leading-out hole 411, for leading out the processed signals while ensuring the integrity of the signal shielding structure 4.

[0030] The utility model discloses a water turbine runner vibration modal testing device, its in working, first through adsorption type fixing spare 32 with fixed installation mechanism 3 on the installation frame 31 adsorption fixed in the metal part of water turbine runner vicinity, complete testing device's quick installation, then, utilize telescopic support 122 and angle adjusting part 123 of adjusting support 12 adjustment laser doppler vibration sensor 11's height and detection angle, make it be in the best measurement state, subsequently, laser doppler vibration sensor 11 in non -contact sensor subassembly 1 based on Doppler effect, emit laser beam irradiation runner surface, receive reflected light and analyze frequency variation, real -time capture the vibration signal in the operation process of runner, the vibration signal transmission to signal acquisition and processing module 2 is gathered, through signal conditioning circuit 21 amplification, filtering, again by data acquisition card 22 analog signal is converted into digital signal, finally through microprocessor 23 preliminary analysis handles, and the vibration signal after processing can be through wireless transmission module 24 wireless sending to external data analysis terminal, to further in -depth analysis, in whole testing process, shielding shell 41 and shielding inner lining 42 of signal shielding structure 4 shielded shell 41 and shielding inner lining 42 synergistic effect, multiple insulate external electromagnetic interference, protect internal element, ensure the accuracy and stability of vibration signal acquisition and data processing, provide reliable data support for the operation state evaluation and fault prediction of water turbine runner.

[0031] The utility model discloses a water turbine runner vibration modal testing device, its installation mode, connecting mode or setting mode are all common mechanical mode, can be implemented as long as the beneficial effect is reached.

[0032] The above-mentioned is only the preferred implementation mode of the utility model, and it should be pointed out that for ordinary technical personnel in the technical field, on the premise of not departing from the technical principle of the utility model, a plurality of improvements and variations can be made, and these improvements and variations should be regarded as the protection scope of the utility model.

Claims

1. A device for testing the vibration mode of a water turbine runner, characterized in that, The application relates to a non-contact sensor assembly for a water turbine, which comprises a non-contact sensor assembly (1), a signal acquisition and processing module (2), a fixed mounting mechanism (3) and a signal shielding structure (4); the signal acquisition and processing module (2) is electrically connected with the non-contact sensor assembly (1); the fixed mounting mechanism (3) is used for mounting the non-contact sensor assembly (1) and the signal acquisition and processing module (2) at a suitable position near a water turbine runner; and the signal shielding structure (4) is arranged outside the non-contact sensor assembly (1) and the signal acquisition and processing module (2).

2. The device for testing the vibration mode of a hydraulic turbine runner as claimed in claim 1, wherein The non-contact sensor assembly (1) comprises a plurality of laser Doppler vibration sensors (11) which are arranged in a distributed mode.

3. The vibration mode testing device for a hydraulic turbine runner as set forth in claim 2, characterized in that, The laser Doppler vibration sensor (11) is mounted on the fixed mounting mechanism (3) through an adjusting support (12), the adjusting support (12) comprises a base (121), a telescopic support rod (122) and an angle adjusting piece (123), the base (121) is fixedly mounted on the fixed mounting mechanism (3), one end of the telescopic support rod (122) is connected with the base (121), and the other end is connected with the laser Doppler vibration sensor (11) through the angle adjusting piece (123).

4. The device for testing the vibration mode of a hydraulic turbine runner as claimed in claim 1, wherein The signal acquisition and processing module (2) comprises a signal conditioning circuit (21), a data acquisition card (22) and a microprocessor (23); the signal conditioning circuit (21) is connected with the non-contact sensor assembly (1); the data acquisition card (22) is connected with the signal conditioning circuit (21); and the microprocessor (23) is connected with the data acquisition card (22).

5. The device for testing the vibration mode of a hydraulic turbine runner as claimed in claim 4, wherein The signal acquisition and processing module (2) further comprises a wireless transmission module (24), and the wireless transmission module (24) is connected with the microprocessor (23).

6. The device for testing the vibration mode of a hydraulic turbine runner as claimed in claim 1, wherein The fixed mounting mechanism (3) comprises a mounting frame (31) and a plurality of adsorptive fixing pieces (32), the mounting frame (31) is in a frame type structure, and the adsorptive fixing pieces (32) are arranged in a distributed mode on the mounting frame (31).

7. The device for testing the vibration mode of a hydraulic turbine runner as claimed in claim 1, wherein The signal shielding structure (4) comprises a shielding outer shell (41) and a shielding inner liner (42); the shielding outer shell (41) is made of metal material and completely wraps the non-contact sensor assembly (1) and the signal acquisition and processing module (2); and the shielding inner liner (42) is made of conductive rubber material and is arranged inside the shielding outer shell (41).

8. The device for testing the vibration mode of a hydraulic turbine runner as claimed in claim 7, characterized in that, A signal leading hole (411) is arranged on the shielding outer shell (41), and a shielding connector (412) is arranged at the signal leading hole (411).

Images