Vibration throw detection system for hydroelectric generating set

Abstract

The utility model relates to the technical field of hydroelectric generating sets, and provides a vibration throw detection system for a hydroelectric generating set, which comprises a protective shell, a water wheel and a main shaft, the main shaft is positioned in the middle of the water wheel, the main shaft is provided with a vibration detector, a fixed hole is arranged in the vibration detector, the main shaft is in sliding connection with the fixed hole, and the main shaft is provided with a vibration sensor. The vibration measuring device is located in the protective shell, the vibration measuring device is fixedly connected with the protective shell, the vibration measuring device is provided with a plurality of transverse vibration sensors and a plurality of circumferential vibration sensors, and the transverse vibration sensors are perpendicular to the circumferential vibration sensors. The transverse vibration sensors and the circumferential vibration sensors are circumferentially arranged around the vibration detector. According to the technical scheme, the problems that in the prior art, only vibration in a single direction can be monitored, vibration in multiple directions is difficult to detect, then detection is not comprehensive and accurate, and judgment of an operator on the vibration amplitude and the vibration frequency of a rack or a bearing is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration swing protection devices, in particular to a vibration swing detection system for a hydroelectric generator set. Background Art

[0002] As a common hydroelectric power generation equipment, the hydroelectric generator set converts water flow energy into mechanical energy and finally into electrical energy. During its operation, the water flow not only provides power for the unit, but also may cause irregular vibration inside the unit, which in turn has an adverse effect on key components such as the frame and bearings. This vibration may be caused by uneven water flow, changes in flow velocity and other external factors.

[0003] The abnormal increase of vibration swing may cause uneven force loading on the mechanical parts inside the unit, resulting in excessive stress and wear of the mechanical system. Especially for key parts such as frames and bearings, long-term high-intensity vibration may cause cracks in the equipment and eventually failure. This failure not only affects the operating efficiency of the hydro-generator unit, but may also cause the breakage of some parts of the unit, causing serious safety hazards and equipment damage.

[0004] The existing method of detecting the vibration of a hydro-turbine generator set is usually to set a vibration sensor on a frame or a bearing, detect the vibration amplitude and vibration frequency of the frame or the bearing through the vibration sensor, and transmit the information to the system of the hydro-turbine generator set, so that the operator can grasp the vibration amplitude and vibration frequency of the frame or the bearing. However, since most of the existing vibration sensors can only sense vibration in one direction, it is difficult to detect vibration in multiple directions, and the detection is not comprehensive and accurate, which affects the operator's judgment on the vibration amplitude and vibration frequency of the frame or the bearing. Utility Model Content

[0005] The utility model proposes a vibration swing detection system for a hydropower unit, which solves the problem in the related technology that vibrations in only a single direction can be monitored, it is difficult to detect vibrations in multiple directions, and the detection is not comprehensive and accurate enough, which affects the operator's judgment on the vibration amplitude and vibration frequency of the frame or the bearing shaft.

[0006] The technical solution of the utility model is as follows:

[0007] A vibration swing detection system for a hydroelectric generator unit comprises a protective shell, a water wheel, and a main shaft, wherein the main shaft is located in the middle of the water wheel, and the water wheel and the main shaft are both located inside the protective shell. The main shaft is provided with a vibration detector, and a fixed opening is provided inside the vibration detector. The main shaft is slidably connected to the fixed opening, and the vibration detector is located inside the protective shell. The vibration detector is fixedly connected to the protective shell, and the vibration detector is provided with a plurality of lateral vibration sensors and a plurality of circumferential vibration sensors, wherein the lateral vibration sensors and the circumferential vibration sensors are perpendicular to each other, and the lateral vibration sensors and the circumferential vibration sensors are both arranged in a circle around the vibration detector.

[0008] Furthermore, the vibrometer includes a fixed shell, a fixed block, and a plurality of buffer springs. The fixed shell is fixedly connected to the protective shell, the fixed block is located inside the fixed shell, the buffer spring is located between the fixed shell and the fixed block, the buffer spring is fixedly connected to the fixed shell and the fixed block, each of the buffer springs is arranged circumferentially with the fixed block as the center, the fixed opening is located in the middle of the fixed block, and the lateral vibration sensor and the circumferential vibration sensor are both located on the fixed block.

[0009] Furthermore, a plurality of buffer pads are provided on one side of the fixed shell facing the fixed block, the buffer pads are fixedly connected to the fixed shell, the number of the buffer pads is the same as the number of the buffer springs, and each of the buffer pads corresponds to each of the buffer springs one by one and are fixedly connected.

[0010] Furthermore, the fixing block is provided with spring fixing grooves having the same number as the buffer springs, the spring fixing grooves are located on the side of the fixing block, the spring fixing grooves are fixedly connected to the fixing block, and the buffer springs are located in the spring fixing grooves.

[0011] Furthermore, a spring fixing protrusion is provided on the side of the fixing block, the spring fixing protrusion is fixedly connected to the fixing block, the spring fixing protrusion is located in the middle of the spring fixing groove, and the buffer spring is located between the spring fixing groove and the spring fixing protrusion.

[0012] Furthermore, the vibrometer is located at one end of the protective shell, the protective shell is provided with a protective cover, the protective cover is detachably connected to the protective shell, and the protective cover is located at the connection end between the protective shell and the vibrometer.

[0013] The working principle and beneficial effects of the utility model are:

[0014] The utility model connects a vibration meter to the main shaft, and measures the vibrations of the main shaft and the water wheel in multiple directions through a lateral vibration sensor and a circumferential vibration sensor installed on the vibration meter. Because the vibration meter is in direct contact with the main shaft, when the main shaft and the water wheel vibrate, the vibration meter can accurately measure the vibration, thereby solving the problem in the related art that only the vibration in a single direction can be monitored, and it is difficult to detect vibrations in multiple directions, and the detection is not comprehensive and accurate, which affects the operator's judgment on the vibration amplitude and vibration frequency of the frame or the bearing shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0016] Figure 1 It is a cross-sectional view of the utility model;

[0017] Figure 2 for Figure 1 A magnified view of point A;

[0018] Figure 3 It is a schematic diagram of the connection between the water wheel, the main shaft and the vibration detector in the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the vibration detector in the utility model.

[0020] In the figure: 1, water wheel; 2, main shaft; 3, vibrometer; 4, protective shell; 5, protective cover; 6, lateral vibration sensor; 7, circumferential vibration sensor; 30, fixed shell; 31, buffer pad; 32, buffer spring; 33, spring fixing groove; 34, fixing block; 35, spring fixing protrusion; 36, fixed opening. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1 to Figure 4As shown, this embodiment proposes a vibration swing detection system for a hydropower unit. The inspection system is composed of a hardware system and a software system. The hardware system is used to monitor the hydropower unit in real time, and the software system is used to receive monitoring data so that the staff can quickly understand the vibration swing data of the hydropower unit. This embodiment mainly introduces the hardware system. The hardware system includes a protective shell 4, a water wheel 1, and a main shaft 2. The main shaft 2 is located in the middle of the water wheel 1. The water wheel 1 and the main shaft 2 are both located inside the protective shell 4. In the prior art, one end of the main shaft 2 is connected to the generator, and the water wheel 1 is driven to rotate by the water flow. The main shaft 2 rotates with the water wheel 1, and the main shaft 2 drives the generator to rotate to achieve power generation. The specific process is not repeated in this embodiment. The main shaft 2 is provided with a vibrometer 3, and the vibrometer 3 is used to measure the vibration of the main shaft 2 and the water wheel 1. A fixed opening 36 is provided inside the vibrometer 3, and the fixed opening 36 is used to allow the main shaft 2 to pass through The main shaft 2 is connected with the fixed opening 36 in a sliding manner. The sliding connection can prevent the rotation of the main shaft 2 from driving the vibrometer 3 to rotate, resulting in the inability to effectively measure the vibration. The vibrometer 3 is located inside the protective shell 4, so that the protective shell 4 can protect the vibrometer 3. The vibrometer 3 is fixedly connected to the protective shell 4 to further fix the vibrometer 3. The vibrometer 3 is provided with a plurality of lateral vibration sensors 6 and a plurality of circumferential vibration sensors 7. The lateral vibration sensors 6 and the circumferential vibration sensors 7 are used to measure the vibration of the main shaft 2 and the water wheel 1. The lateral vibration sensors 6 and the circumferential vibration sensors 7 are perpendicular to each other, so that the lateral vibration sensors 6 and the circumferential vibration sensors 7 have different measuring directions, thereby realizing multi-directional vibration measurement. The lateral vibration sensors 6 and the circumferential vibration sensors 7 are arranged in a circle around the vibrometer 3, further realizing multi-directional vibration measurement.

[0023] In this embodiment, the vibrometer 3 includes a fixed shell 30, a fixed block 34, and a plurality of buffer springs 32. The fixed shell 30 is fixedly connected to the protective shell 4. The fixed connection between the fixed shell 30 and the protective shell 4 realizes the fixed connection between the protective shell 4 and the vibrometer 3. The fixed block 34 is located inside the fixed shell 30. The buffer spring 32 is located between the fixed shell 30 and the fixed block 34. The buffer spring 32 is fixed to the fixed shell 30 and the fixed block 34. The buffer springs 32 are arranged circumferentially with the fixed block 34 as the center. The buffer spring 32 can stabilize the position of the fixed block 34 and can also buffer the vibration of the main shaft 2 or the water wheel 1. The fixed opening 36 is located in the middle of the fixed block 34. The lateral vibration sensor 6 and the circumferential vibration sensor 7 are both located on the fixed block 34.

[0024] In this embodiment, a plurality of buffer pads 31 are provided on the surface of the fixed shell 30 facing the fixed block 34. The buffer pads 31 are fixedly connected to the fixed shell 30. The number of the buffer pads 31 is the same as the number of the buffer springs 32. The buffer pads 31 correspond to the buffer springs 32 one by one and are fixedly connected. The buffer pads 31 can further fix the connection between the buffer springs 32 and the fixed shell 30, and can further buffer the vibration of the main shaft 2 or the water wheel 1.

[0025] In this embodiment, the fixing block 34 is provided with spring fixing grooves 33 of the same number as the buffer springs 32, the spring fixing grooves 33 are located on the side of the fixing block 34, the spring fixing grooves 33 are fixedly connected to the fixing block 34, the buffer springs 32 are located in the spring fixing grooves 33, a spring fixing protrusion 35 is provided on the side of the fixing block 34, the spring fixing protrusion 35 is fixedly connected to the fixing block 34, the spring fixing protrusion 35 is located in the middle of the spring fixing groove 33, the buffer spring 32 is located between the spring fixing groove 33 and the spring fixing protrusion 35, the spring fixing groove 33 and the spring fixing protrusion 35 are both used to fix the position of the buffer spring 32, so that the buffer spring 32 can stably play its role.

[0026] In this embodiment, the vibrometer 3 is located at one end of the protective shell 4. The protective shell 4 is provided with a protective cover 5. The protective cover 5 is detachably connected to the protective shell 4. The protective cover 5 is located at the connection end between the protective shell 4 and the vibrometer 3. The protective cover 5 can protect the vibrometer 3 and also facilitate maintenance personnel to maintain the vibrometer 3.

[0027] In this embodiment, each component can be any shape that can achieve the above-mentioned effect, wherein the shapes of the fixed shell 30 and the fixed block 34 are preferably hollow cylinders. The fixed block 34 in the shape of a hollow cylinder can effectively avoid collision with the fixed shell 30 when subjected to severe vibration. If the fixed shell 30 adopts an angular shape, when the fixed block 34 is subjected to severe vibration, its corner may collide with the fixed shell 30, thereby causing damage to the fixed block 34 or the fixed shell 30; the fixed shell 30 is a hollow cylinder, which can not only better connect with the protective shell 4, but also avoid the same angular collision problem as the above-mentioned fixed block 34.

[0028] The working principle of this embodiment is as follows: when the main shaft 2 or the water wheel 1 vibrates, the vibration is transmitted to the fixed block 34 through the main shaft 2, and the fixed block 34 vibrates along with the main shaft 2. The lateral vibration sensor 6 and the circumferential vibration sensor 7 detect the vibration and report the detection data to the staff. When vibration occurs, the buffer spring 32 is elastically deformed by the vibration. Through the action of the elastic restoring force, the buffer spring 32 will bring the fixed block 34 back to its original position, and then bring the main shaft 2 back to its original position, thereby reducing the vibration.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vibration swing detection system for a hydroelectric generator set, comprising a protective housing (4), a water wheel (1), and a main shaft (2), wherein the main shaft (2) is located in the middle of the water wheel (1), and the water wheel (1) and the main shaft (2) are both located inside the protective housing (4), characterized in that: The main shaft (2) is provided with a vibrometer (3), a fixed opening (36) is provided inside the vibrometer (3), the main shaft (2) is slidably connected to the fixed opening (36), the vibrometer (3) is located inside the protective shell (4), the vibrometer (3) is fixedly connected to the protective shell (4), the vibrometer (3) is provided with a plurality of lateral vibration sensors (6) and a plurality of circumferential vibration sensors (7), the lateral vibration sensors (6) and the circumferential vibration sensors (7) are perpendicular to each other, and the lateral vibration sensors (6) and the circumferential vibration sensors (7) are arranged in a circle around the vibrometer (3).

2. A vibration swing detection system for a hydroelectric unit according to claim 1, characterized in that: The vibrometer (3) comprises a fixed housing (30), a fixed block (34), and a plurality of buffer springs (32); the fixed housing (30) is fixedly connected to a protective housing (4); the fixed block (34) is located inside the fixed housing (30); the buffer spring (32) is located between the fixed housing (30) and the fixed block (34); the buffer spring (32) is fixedly connected to the fixed housing (30) and the fixed block (34); the buffer springs (32) are circumferentially arranged with the fixed block (34) as the center; the fixed opening (36) is located in the middle of the fixed block (34); and the lateral vibration sensor (6) and the circumferential vibration sensor (7) are both located on the fixed block (34).

3. A vibration swing detection system for a hydroelectric unit according to claim 2, characterized in that: A plurality of buffer pads (31) are provided on one side of the fixed shell (30) facing the fixed block (34); the buffer pads (31) are fixedly connected to the fixed shell (30); the number of the buffer pads (31) is the same as the number of the buffer springs (32); and each of the buffer pads (31) corresponds to each of the buffer springs (32) one by one and is fixedly connected.

4. A vibration swing detection system for a hydroelectric unit according to claim 2, characterized in that: The fixing block (34) is provided with spring fixing grooves (33) having the same number as the buffer springs (32); the spring fixing grooves (33) are located on the side of the fixing block (34); the spring fixing grooves (33) are fixedly connected to the fixing block (34); and the buffer springs (32) are located in the spring fixing grooves (33).

5. A vibration swing detection system for a hydroelectric unit according to claim 4, characterized in that: A spring fixing protrusion (35) is provided on the side of the fixing block (34), the spring fixing protrusion (35) is fixedly connected to the fixing block (34), the spring fixing protrusion (35) is located in the middle of the spring fixing groove (33), and the buffer spring (32) is located between the spring fixing groove (33) and the spring fixing protrusion (35).

6. A vibration swing detection system for a hydroelectric unit according to claim 2, characterized in that: The vibrometer (3) is located at one end of a protective shell (4); the protective shell (4) is provided with a protective cover (5); the protective cover (5) is detachably connected to the protective shell (4); and the protective cover (5) is located at the connection end between the protective shell (4) and the vibrometer (3).

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