Air supply device of dynamic and static double-disc dynamic test system

Abstract

The invention relates to the technical field of water turbines, and discloses an air supply device of a dynamic and static double-disc dynamic test system for simulating air supply and vibration reduction of a top cover, and the surface of a cover plate of the test device is provided with an air supply mechanism for vibration reduction of a dynamic and static double-disc structure; safe, controllable and measurable air supply is realized through the cooperation of the cover plate, the air supply hole, the air supply pipe, the air supply flow meter, the air content sensor, the exhaust pipe, the exhaust valve and the pressure gauge; the air supply device is connected with an external air pump through an air supply pipe and supplies air into the dynamic and static double-disc device; the air supply amount is detected through an air supply flowmeter; the content of dissolved oxygen in water is measured through a gas content sensor, so that real-time gas content data is obtained; pressure is monitored through a pressure gauge, and air supply pressure is controlled; the safety valve guarantees that the system does not exceed the limited pressure intensity, guarantees that the test is safe and controllable, is simple in structure, can simulate the air supply and vibration reduction process of the pump turbine top cover, and is used for simulation measurement, thereby facilitating the prolonging of the service life of the pump turbine.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic turbines, and specifically to an air supply device for a dynamic and static double-disk dynamics test system that simulates air supply and vibration reduction of a top cover. Background Technique

[0002] As an important hydraulic power generation equipment, the operating stability of a hydraulic turbine is directly related to the reliability and efficiency of the entire power supply system. In a hydraulic turbine system, resonance may occur when the excitation force frequency and mode are close to the natural frequency and mode of mechanical components. The natural frequency and mode of the structure also have a great influence on the system stability related to structural deformation and may cause self-excited vibration. In engineering, the method of air supply is often used to reduce vibration and noise. Therefore, it is very important to study the dynamic characteristics (natural frequency and mode) of hydraulic machinery structures under air supply conditions. The dynamic test of a disk in water is often used to simulate the dynamic characteristics of a hydraulic turbine runner. The experimental research results of the wet mode of the dynamic and static double-disk device under air supply conditions, on the one hand, provide verification data for the numerical analysis method of wet mode parameters of hydraulic machinery, and at the same time, are enlightening for the analysis of the structural dynamic characteristics of the runner. For this reason, the present invention proposes an air supply device for a dynamic and static double-disk dynamics test system, which can be used to measure the dynamic characteristics of the dynamic and static double-disk structure under air supply conditions. Summary of the Invention

[0003] The present invention aims to provide an air supply device for a dynamic and static double-disk dynamics test system. Under an external excitation at a fixed frequency, a laser vibrometer is used to obtain the amplitude change of the rotor disk. After air is supplied into the dynamic and static double disks, the amplitude change on the rotor surface at different gas contents is obtained to verify the air supply and vibration reduction effect, study the influence of air supply on the dynamic characteristics of the dynamic and static double-disk structure, and simulate the air supply and vibration reduction mechanism of the hydraulic turbine top cover. To solve the problems raised in the above background technique.

[0004] To achieve the above object, the present invention provides the following technical solution: An air supply device for a dynamic and static double-disk device, including a sealed cavity composed of a dynamic and static double-disk, a cavity and a cover plate. The cover plate is provided on the upper surface with an air supply mechanism for vibration reduction of the top cover of the dynamic and static double-disk.

[0005] The air supply mechanism includes four groups of air supply pipes, two groups of exhaust pipes, a pressure gauge and an oxygen content meter. Four air supply holes are provided on the upper surface of the top cover of the dynamic and static double-disk. The four air supply pipes are respectively communicated with the four air supply holes. Flow meters for monitoring the air supply volume are provided in the four air supply pipes. The two exhaust pipes are both provided on the upper surface of the cover plate. Exhaust valves are provided on the two exhaust pipes. The pressure gauge and the oxygen content meter are installed on the upper surface of the cover plate.

[0006] Preferably, the four groups of the air supplement pipes are circumferentially and symmetrically arranged on the cover plate. Two groups of the exhaust pipes are arranged between two groups of the air supplement pipes, and the two groups of the exhaust pipes are arranged on the same straight line and symmetrically with the two groups of the air supplement pipes. The gas content sensor and the pressure gauge are symmetrically arranged in the middle of the straight line where the other two groups of the air supplement pipes are located.

[0007] Preferably, a main shaft passes through the middle of the dynamic and static double-disk cover plate, and the axes of the rotor disk body and the main shaft are arranged on the same straight line. A sealing device is arranged between the main shaft and the cover plate. The motor drives the main shaft and the rotor disk body to rotate.

[0008] Preferably, the rotor disk body and the stator disk body are arranged at the bottom of the inner cavity of the dynamic and static double disks.

[0009] At present, there is no test system for simulating the air supplement and vibration reduction of the top cover. The beneficial effects of the present invention are as follows: The present invention mainly realizes the cooperation among the top cover, the air supplement holes, the air supplement pipes, the air supplement flow meters, the gas content sensors, the exhaust pipes, the exhaust valves and the pressure gauges. The air supplement pipes are connected to an external air pump, so as to facilitate the supply of gas to the dynamic and static double-disk device. Then, the air supplement amount is detected by the air supplement flow meter, the dissolved oxygen content in water is measured by the gas content sensor, so as to obtain the real-time gas content data. The pressure is monitored by the pressure gauge, and the system pressure safety is ensured by the exhaust valve. The whole system can simulate the air supplement and vibration reduction process of the top cover of the pump-turbine, so as to improve the service life of the pump-turbine. Description of the Drawings

[0010] Figure 1 is the overall structural schematic diagram of the present invention;

[0011] Figure 2 is the structural schematic diagram of the upper surface of the dynamic and static double-disk top cover of the present invention;

[0012] Figure 3 is the structural schematic diagram of the inner cavity of the dynamic and static double disks of the present invention.

[0013] In the figure: 1. Dynamic and static double disks; 2. Water inlet; 3. Dynamic and static double-disk top cover; 4. Motor; 5. Air supplement mechanism; 51. Air supplement pipe; 52. Air supplement flow meter; 53. Pressure gauge; 54. Exhaust pipe; 55. Exhaust valve; 56. Gas content sensor; 6. Main shaft; 7. Rotor body; 8. Patch; 9. Drainage port; 10. Stator body. Detailed Embodiments

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] Please refer to Figures 1-3 Figures 1-3 , a gas supplementing device of the present invention includes a dynamic and static double - disc gas supplementing device, including a dynamic and static double - disc device 1. A dynamic and static double - disc top cover 3 is arranged at the upper end of the dynamic and static double - disc device 1. A gas supplementing mechanism 5 for damping the dynamic and static double - disc top cover 3 is arranged on the upper surface of the dynamic and static double - disc top cover 3;

[0016] The gas supplementing mechanism 5 includes four groups of gas supplementing pipes 51, two groups of exhaust pipes 54 and a pressure gauge 53. Four gas supplementing holes are arranged on the upper surface of the dynamic and static double - disc top cover 3. The four groups of gas supplementing pipes 51 are respectively communicated with the four gas supplementing holes. Gas supplementing flow meters 52 for monitoring the gas flow are arranged in the four groups of gas supplementing pipes 51. The pressure gauge 53 is installed on the upper surface of the dynamic and static double - disc top cover 3. The two groups of exhaust pipes 54 are both arranged on the upper surface of the dynamic and static double - disc top cover 3. Exhaust valves 55 are arranged on the two groups of exhaust pipes 54. A gas content sensor 56 for detecting the dissolved oxygen content in water is arranged on the upper surface of the dynamic and static double - disc top cover 3.

[0017] The four groups of gas supplementing pipes 51 are circumferentially symmetrically arranged on the cover plate. The two groups of exhaust pipes 54 are arranged between two of the four groups of gas supplementing pipes 51. The two groups of exhaust pipes 54 and the two groups of gas supplementing pipes 51 are arranged on the same straight line and symmetrically. The gas content sensor 56 and the pressure gauge 53 are symmetrically arranged in the middle of the straight line where the other two groups of gas supplementing pipes are located. During the test, different groups of gas supplementing pipes can be used to supplement gas separately or simultaneously, which is convenient for simulating gas supplementing and vibration damping. The gas content sensor 56 is a prior art and will not be elaborated too much.

[0018] The exhaust valve 55 has an electronic linkage function and is connected to a pressure monitoring system. When the air pressure exceeds a pre - set critical value, the exhaust valve can be automatically opened, and at the same time, the gas supplementing device immediately stops the gas supplementing operation, so as to ensure that the air pressure in the dynamic and static double - disc device is always within a safe range.

[0019] A main shaft 6 passes through the middle of the dynamic and static double - disc cover 3. The axes of the rotor disc body 7 and the main shaft 6 are arranged on the same straight line. There is a sealing device between the main shaft and the cover plate. The motor 4 drives the main shaft and the rotor disc body 7 to rotate.

[0020] In use, the air pump of the peripheral device is turned on to supply air into the air replenishing holes through the air replenishing pipe 51, thereby facilitating the supply of air into the dynamic and static double-disk device 1. The air replenishing flowmeter 52 in the air replenishing pipe 51 can be used to obtain the air replenishing volume. The dissolved oxygen content in the water is measured by the gas content sensor 56 to obtain real-time gas content data. The pressure is monitored by the pressure gauge 53, the system pressure safety is ensured by the exhaust valve 55, and the pressure is adjusted through the air inlet 51 and the air outlet 54 to simulate the operation state of the dynamic and static double-disk device 1 under different pressures, so as to simulate and test the air replenishing and vibration reduction process of the top cover of the pump-turbine, thereby facilitating the improvement of the service life of the pump-turbine.

[0021] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air supplement device for a dynamic and static double-disk dynamics test system, comprising a dynamic and static double disk (1) composed of a rotating disk (rotor disk) and a stationary disk (stator disk), characterized in that: The rotor disk is located in a sealed cavity formed by a stator disk, a cavity and an upper end cover plate (3). An air supplement mechanism (5) for damping the dynamic and static double-disk dynamics test system is arranged on the upper surface of the top cover (3). The air supplement structure (5) includes four groups of air supplement pipes (51), two groups of exhaust pipes (54) and a pressure gauge (53). Two groups of air supplement holes are arranged on the upper surface of the cover plate (3) of the dynamic and static double-disk dynamics test system. The four groups of air supplement pipes (51) are respectively communicated with the four air supplement holes. Air supplement flow meters (52) for monitoring the gas flow are arranged in the four groups of air supplement pipes (51). The pressure gauge (53) is installed on the upper surface of the cover plate (3). The two groups of exhaust pipes (54) are arranged on the upper surface of the cover plate (3). Exhaust valves (55) are arranged on the two groups of exhaust pipes (54). An air content sensor (56) for detecting the dissolved oxygen content in water is arranged on the upper surface of the cover plate (3).

2. The air supplement device of a dynamic and static dual-disk kinetic test system according to claim 1, characterized in that: The four groups of air supplement pipes (51) are circumferentially symmetrically arranged on the cover plate. The two groups of exhaust pipes (54) are arranged between two of the four groups of air supplement pipes (51). The two groups of exhaust pipes (54) and the two groups of air supplement pipes (51) are arranged on the same straight line and symmetrically. The air content sensor (56) and the pressure gauge (53) are symmetrically arranged in the middle of the straight line where the other two groups of air supplement pipes are located.

3. The air supplement device of a dynamic and static double-disk dynamics test system according to claim 2, wherein: At the bottom of the inner cavity of the dynamic and static double-disk (1), a rotor disk body (7) and a stator disk body (10) are arranged. A main shaft (6) passes through the center of the rotor disk body (7) in the middle of the cover plate of the dynamic and static double-disk. The center axes of the rotor disk body (7) and the main shaft (6) are arranged on the same straight line. A sealing device is arranged between the main shaft and the cover plate. The motor (4) drives the main shaft (6) and the rotor disk body (7) to rotate.

4. The air supplement device of a dynamic and static double-disk kinetic testing system according to claim 3, characterized in that: There is a water inlet (2) around the inner cavity of the dynamic and static double-disk (1). The inner cavity of the dynamic and static double-disk (1) is filled with liquid through the water inlet (2).

5. The air supplement device of a dynamic and static double-disk dynamics test system according to claim 4, characterized in that: There is a water outlet (9) at the bottom of the inner cavity of the dynamic and static double-disk (1). The liquid in the inner cavity of the dynamic and static double-disk (1) is emptied through the water inlet (9).

6. The air supplement device of a dynamic and static double-disk dynamics test system according to claim 5, characterized in that: There are four groups of patches (8) on the upper surface of the rotor disk body (7). The dynamic characteristics of the rotor disk body (7) are obtained by changing the test through the patch voltage signal.

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