Hydro-generator rotor dynamic stress test system
By designing a rotor dynamic stress test system for hydrowheel generators, the problems of stress measurement and online monitoring of rotors under dynamic loads are solved by using welding structures and mechanically processed bolt holes, and the safety of the structure is achieved and flexibility, reducing crack risk.
Patent Information
- Application Number
- CN202421098781.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-05-20
AI Technical Summary
The rotor of the hydrowheel generator is prone to high stress under the action of dynamic load, resulting in fatigue crack problems. It is difficult for the existing technology to effectively measure and analyze dynamic stress, and it lacks flexible online monitoring and maintenance methods.
A rotor stress test system for hydrowheel generators was designed. Through the welding structure of the front baffle, the back baffle, the top board, the side board and the base connecting plate, combined with the mechanically processed bolt holes and ventilation holes, it forms a reusable mount for mounting and fixing the rotor, enabling dynamic stress testing and online monitoring.
It realizes the simplicity and safety of structural design, reliable installation method, and is suitable for hydrowheel generator sets of different structural forms. It can be used multiple times, improving the accuracy and flexibility of rotor dynamic stress testing and reducing crack risks.
Smart Images
Figure CN222336745U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of hydro-generator test, in particular to a hydro-generator rotor dynamic stress test system. Background Art
[0002] In engineering, we often encounter situations where components are subjected to dynamic loads, such as high-speed rotating propellers, emergency brake shafts, beams subjected to forced vibration, etc. Since the stress of components under dynamic loads is much greater than the stress under static loads, it is very important to measure and analyze the dynamic stress of components under dynamic loads. This test system takes the rotor of a hydro-generator as the research object, and measures the dynamic stress of the rotor when it is subjected to forced vibration and impact under various operating conditions.
[0003] The generation of dynamic stress is inevitable for hydro-turbine generator sets. With the increase of the unit operation cycle, the rotor of the hydro-turbine generator will have fatigue cracks. The way to effectively reduce or avoid the generation or expansion of cracks in the rotor of the hydro-turbine generator is to optimize the unit operation mode, so that the unit can avoid long-term operation in the strong vibration area and try to operate under the optimal design conditions. At the same time, during the operation of the unit, the online monitoring of the vibration and swing of each part of the unit should be strengthened, and the inspection of the rotor and other related rotating parts and the tracking inspection and treatment of defects should be strengthened during maintenance. Utility Model Content
[0004] The purpose of the utility model is to provide a test system for dynamic stress test of a hydro-turbine generator rotor. The technical scheme is as follows: the system is composed of a front baffle, a rear baffle, a top plate, a side plate, a base connecting plate, a front baffle bolt hole, a rear baffle bolt hole, a top plate bolt hole, a side plate ventilation hole, a base bolt hole and a connection outlet hole. The front baffle, the rear baffle, the top plate and the side plate are connected by welding. Two front baffle bolt holes are machined on the front baffle, four rear baffle bolt holes are machined on the rear baffle, six top plate bolt holes and two connection outlet holes are machined on the top plate, side plate ventilation holes are machined at intervals on the side plates, and four base bolt holes are machined on both sides of the base connecting plate.
[0005] In the above-mentioned hydro-generator rotor dynamic stress test system, the base connecting plate is formed by bending a part of the side plate by 90 degrees.
[0006] Compared with the prior art, the beneficial effects of the utility model are:
[0007] The structure design is simple, the installation method is firm and reliable, it is easy to install and fix on the rotor bracket, can be used repeatedly, has high safety and reliability, and can be applied to rotor dynamic stress tests of hydro-turbine generator sets with various structural forms. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 The figure is a front view of a hydro-generator rotor dynamic stress test system.
[0009] Figure 2 A side view of a hydro-generator rotor dynamic stress test system.
[0010] Figure 3 It is the rear view of a hydro-generator rotor dynamic stress test system.
[0011] Figure 4 A three-dimensional view of a hydro-generator rotor dynamic stress test system.
[0012] Markings in the figure: 1-front baffle, 2-rear baffle, 3-top plate, 4-side plate, 5-base connecting plate, 6-front baffle bolt hole, 7-rear baffle bolt hole, 8-top plate bolt hole, 9-side plate ventilation hole, 10-base bolt hole, 11-connecting outlet hole. DETAILED DESCRIPTION
[0013] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.
[0014] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the utility model is a test system for dynamic stress test of a hydro-turbine generator rotor, which consists of a front baffle 1, a rear baffle 2, a top plate 3, a side plate 4, a base connecting plate 5, a front baffle bolt hole 6, a rear baffle bolt hole 7, a top plate bolt hole 8, a side plate ventilation hole 9, a base bolt hole 10 and a connecting wire outlet hole 11. The front baffle 1, the rear baffle 2, the top plate 3 and the side plate 4 are connected by welding, and the base connecting plate 5 is formed by bending a part of the side plate 4 by 90 degrees. Two front baffle bolt holes 6 are machined on the front baffle 1, four rear baffle bolt holes 7 are machined on the rear baffle 2, six top plate bolt holes 8 and two connecting wire outlet holes 11 are machined on the top plate 3, side plate ventilation holes 9 are machined at intervals on the side plate 4, and four base bolt holes 10 are machined on both sides of the base connecting plate 5.
[0015] Working principle: The rotor of a hydro-turbine generator is an important part of a hydro-turbine generator set. The transition zone and intersection of the rotor shaft diameter change are the weak links of the entire rotor in terms of mechanical properties. This area is prone to cracks during the operation of the unit. The main cause of rotor cracks is the effect of stress. During the operation of the unit, the rotor is subjected to the combined effect of high-speed centrifugal force, and there is a high-stress area in the rotor, which is mainly distributed at the location where the geometric cross-section changes.
[0016] Stress testing is an important means to analyze and study the stress conditions and working conditions of parts, mechanisms and structures, verify the correctness of design calculation results, and determine the load spectrum and mechanism of certain physical phenomena during the operation of the whole machine. It can determine the law of change of rotor dynamic stress over time, perform spectrum analysis on it, and study the rigidity of the corresponding structure based on statistical characteristics to verify the rationality of the structural design.
[0017] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the scope and spirit of the present invention. If these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications.
Claims
1. A hydro-generator rotor dynamic stress test system, characterized by: The utility model comprises a front baffle plate (1), a rear baffle plate (2), a top plate (3), a side plate (4), a base connecting plate (5), a front baffle plate bolt hole (6), a rear baffle plate bolt hole (7), a top plate bolt hole (8), a side plate ventilation hole (9), a base bolt hole (10) and a connection outlet hole (11). The front baffle plate (1), the rear baffle plate (2), the top plate (3) and the side plate (4) are connected by welding. Two front baffle plate bolt holes (6) are machined on the front baffle plate (1), four rear baffle plate bolt holes (7) are machined on the rear baffle plate (2), six top plate bolt holes (8) and two connection outlet holes (11) are machined on the top plate (3), side plate ventilation holes (9) are machined at intervals on the side plate (4), and four base bolt holes (10) are machined on both sides of the base connecting plate (5).
2. A hydro-generator rotor dynamic stress test system according to claim 1, characterized in that: The base connecting plate (5) is formed by bending a portion of the side plate (4) at 90 degrees.