CN115855351A - Stress monitoring system for water pump turbine top cover bolt - Google Patents
Stress monitoring system for water pump turbine top cover bolt Download PDFInfo
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- CN115855351A CN115855351A CN202211518114.6A CN202211518114A CN115855351A CN 115855351 A CN115855351 A CN 115855351A CN 202211518114 A CN202211518114 A CN 202211518114A CN 115855351 A CN115855351 A CN 115855351A
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Abstract
The invention relates to a stress monitoring system for a water pump turbine top cover bolt, which aims to solve the problem that the measurement is inaccurate in the process of measuring the stress of the water pump turbine top cover bolt in the prior art. The technical scheme of the invention is as follows: the top cover pressure measurement module is used for measuring the pressure borne by each key measuring point of the top cover; the top cover bolt stress measuring module is used for measuring the stress of the top cover bolt; the PLC I is electrically connected with the top cover pressure measuring module; the PLC II is electrically connected with the PLC I and used for calculating theoretical stress of the top cover bolt based on the top cover load calculated by the PLC I; the PLC III is electrically connected with the top cover bolt stress measuring module; the PLC IV is electrically connected with the PLC II and the PLC III; and the alarm module is electrically connected with the PLC IV and used for giving an alarm when the PLC IV generates an alarm signal. The invention is suitable for the technical field of pumped storage units.
Description
Technical Field
The invention relates to a stress monitoring system for a water pump turbine top cover bolt. The method is suitable for the technical field of pumped storage units.
Background
Pumped storage is a green, low-carbon, clean and flexible regulation power supply of an electric power system with the largest large-scale development condition at present, and is an important mode for ensuring the safe and stable operation of the electric power system. The method can not only effectively promote the consumption of new energy, but also enhance the balance adjustment capability of the power system.
The pumped storage power station unit is frequently started and has complex operation condition. The main pressure-bearing part top cover and the seat ring of the pump turbine are connected through high-pressure water flow, and the safety of a flow channel is directly related to the connection design of the top cover and the seat ring. The tie bolt between top cap and the seat ring mainly bears the load of inside high-pressure rivers to the top cap, if the load is too big, then the bolt breaks easily for sealed inefficacy between top cap and the seat ring will bring gushing water in a large number and get into the factory building, causes the water logging factory building accident, brings the serious loss for power station and personnel life safety. In recent years, accidents caused by the fracture of the top cover bolt of hydropower stations at home and abroad happen occasionally, and the safety of personnel and property of the hydropower stations is seriously threatened. Therefore, how to accurately monitor the stress condition of the top cover bolt is very important for the safe operation of the pump turbine.
At present, stress monitoring of a top cover bolt mainly comprises a stress sheet method, a strain gauge method, an ultrasonic wave method and the like, and the stress condition of the bolt is mainly measured by mounting a stress sheet, a strain gauge or an ultrasonic probe and the like on the bolt, so that the stress state of the bolt is reflected. The various methods have certain limitations in the application process, for example, the stress sheet method has difficulty in installation in certain occasions; the stress meter method usually needs to embed a stress meter into a bolt in advance, a mounting hole needs to be reserved in advance in the bolt production process, and the application of the method in the established power station is limited; the ultrasonic method has high calibration requirements on a measurement system. Therefore, the single measurement system may affect the measurement result of the bolt stress due to installation limitation of the monitoring device or failure of the monitoring device.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: to the problem that above-mentioned exists, provide a pump turbine top cap bolt stress monitoring system to solve prior art and measure inaccurate problem that probably appears measuring in the process of measuring pump turbine top cap bolt stress.
The technical scheme adopted by the invention is as follows: the utility model provides a pump turbine top cap bolt stress monitoring system which characterized in that includes:
the top cover pressure measurement module is used for measuring the pressure borne by each key measurement point of the top cover;
the top cover bolt stress measuring module is used for measuring the stress of the top cover bolt;
the PLC I is electrically connected with the top cover pressure measuring module and used for calculating the load of the top cover based on the pressure measured by each key measuring point of the top cover by the top cover pressure measuring module; the calculation is a conventional calculation method, and a calculation method published by book Water Pump Water turbine, china electric Power Press 2019.10 (ISBN 978-5198-1566-0) is adopted.
The PLC II is electrically connected with the PLC I and used for calculating theoretical stress of the top cover bolt based on the top cover load calculated by the PLC I;
the PLC III is electrically connected with the top cover bolt stress measuring module and is used for acquiring the actual stress of the top cover bolt measured by the top cover bolt stress measuring module;
the PLC IV is electrically connected with the PLC II and the PLC III and is used for comparing the theoretical stress of the top cover bolt of the PLC II with the actual stress of the top cover bolt of the PLC III and generating an alarm signal when the deviation of the theoretical stress and the actual stress exceeds a preset range;
and the alarm module is electrically connected with the PLC IV and used for giving an alarm when the PLC IV generates an alarm signal.
The key measuring points on the top cover comprise a pressure measuring point A between the movable guide vane and the fixed guide vane, a pressure measuring point B between the rotating wheel and the movable guide vane, a top cover inlet pressure measuring point C, a labyrinth ring inlet pressure measuring point D and a labyrinth ring outlet pressure measuring point E.
The top cover pressure measurement module comprises a measuring head and pressure sensors which are in one-to-one correspondence with each key measuring point, wherein the measuring head is arranged at the position of the corresponding measuring point, and a pipeline for leading pressurized water to the pressure sensors is arranged between the measuring head and the corresponding pressure sensors.
The top cover bolt stress measuring module is provided with an ultrasonic probe arranged on the top cover bolt and an ultrasonic transmitting and signal collecting device electrically connected with the ultrasonic probe.
The ultrasonic probe is arranged at the upper end of the top cover bolt.
The invention has the beneficial effects that: the pressure of each key measuring point of the top cover is measured by the top cover pressure measuring module, and the load of the top cover is calculated by the pressure of each key measuring point, so that the theoretical stress of the top cover bolt is obtained; meanwhile, the top cover bolt stress measuring module is used for measuring the actual stress of the top cover bolt and comparing the actual stress with the theoretical stress of the top cover bolt, so that the purpose of mutual verification is achieved, the problem that the measurement of the traditional single bolt stress measuring system is inaccurate due to equipment faults and the like is solved, and the reliability of the bolt stress monitoring system is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a system architecture according to an embodiment.
FIG. 2 is a schematic view of the arrangement of measuring points and probes in the embodiment.
1. A measuring head; 2. a pipeline; 3. a pressure sensor; 4. a cable; 5. a PLC controller I; 6. a PLC controller II; 7. an ultrasonic probe; 8. an ultrasonic emission and signal acquisition device; 9. a PLC controller III; 10. and a PLC controller IV.
Detailed Description
As shown in fig. 1, this embodiment is a pump turbine roof bolt stress monitoring system, including roof pressure measurement module, roof bolt stress measurement module, PLC controller i, PLC controller ii, PLC controller iii, PLC controller iv and alarm module.
The pressure measuring module of the top cover is used for measuring the pressure borne by each key measuring point of the top cover (comprising a pressure measuring point A between a movable guide vane and a fixed guide vane, a pressure measuring point B between a rotating wheel and the movable guide vane, a top cover inlet pressure measuring point C, a labyrinth ring inlet pressure measuring point D and a labyrinth ring outlet pressure measuring point E, see figure 2).
In this embodiment, the top cover bolt stress measuring module has an ultrasonic probe (see fig. 2) disposed at the upper end of the top cover bolt, and an ultrasonic emission and signal acquisition device electrically connected to the ultrasonic probe via a cable, and the ultrasonic emission and signal acquisition device can emit an ultrasonic signal to the ultrasonic probe for measuring the bolt stress; meanwhile, the ultrasonic probe transmits a stress measurement signal of the top cover bolt to the ultrasonic emission and signal acquisition device through the transmission cable 4.
In the embodiment, the PLC I is electrically connected with the pressure sensor in the top cover pressure measurement module through a cable, and is used for acquiring the pressure borne by each key measurement point of the top cover measured by the top cover pressure measurement module and calculating the load of the top cover by combining a preset corresponding empirical formula.
In the embodiment, the PLC II is electrically connected with the PLC I through a cable and is used for acquiring the top cover load calculated by the PLC I and calculating the theoretical calculation stress of the top cover bolt by combining a preset corresponding empirical formula.
In this embodiment, the PLC controller iii is electrically connected to the ultrasonic emission and signal acquisition device in the top cap bolt stress measurement module via a cable, and is configured to obtain the actual stress of the top cap bolt measured by the top cap bolt stress measurement module.
In the embodiment, the PLC IV is electrically connected with the PLC II and the PLC III through cables and used for comparing the theoretical stress of the top cover bolt of the PLC II with the actual stress of the top cover bolt of the PLC III and generating an alarm signal when the deviation of the two exceeds a preset range.
In this embodiment, the alarm module is electrically connected with the PLC controller iv through a cable, and is configured to send an alarm when the PLC controller iv generates an alarm signal.
In this embodiment, the PLC controllers are separately described, which does not mean that a plurality of PLC controllers are necessarily used to implement the PLC controllers in this embodiment, and the separate description in this embodiment is mainly used to facilitate the distinction, so that in order to save cost, one PLC controller may be used to implement the functions to be implemented by the plurality of PLC controllers.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention and is not intended to limit the invention, which has been described in detail with reference to the foregoing examples, but it will be apparent to those skilled in the art that various changes in the form and details may be made therein without departing from the spirit and scope of the invention. All changes, modifications and equivalents that come within the spirit and scope of the invention are desired to be protected.
Claims (5)
1. The utility model provides a pump turbine top cap bolt stress monitoring system which characterized in that includes:
the top cover pressure measurement module is used for measuring the pressure borne by each key measuring point of the top cover;
the top cover bolt stress measuring module is used for measuring the stress of the top cover bolt;
the PLC I is electrically connected with the top cover pressure measuring module and used for calculating the load of the top cover based on the pressure measured by each key measuring point of the top cover by the top cover pressure measuring module;
the PLC II is electrically connected with the PLC I and used for calculating theoretical stress of the top cover bolt based on the top cover load calculated by the PLC I;
the PLC III is electrically connected with the top cover bolt stress measuring module and is used for acquiring the actual stress of the top cover bolt measured by the top cover bolt stress measuring module;
the PLC IV is electrically connected with the PLC II and the PLC III and is used for comparing the theoretical stress of the top cover bolt of the PLC II with the actual stress of the top cover bolt of the PLC III and generating an alarm signal when the deviation of the theoretical stress and the actual stress exceeds a preset range;
and the alarm module is electrically connected with the PLC IV and used for giving an alarm when the PLC IV generates an alarm signal.
2. The pump turbine roof bolt stress monitoring system of claim 1, characterized in that: the key measuring points on the top cover comprise a pressure measuring point A between the movable guide vane and the fixed guide vane, a pressure measuring point B between the rotating wheel and the movable guide vane, a top cover inlet pressure measuring point C, a labyrinth ring inlet pressure measuring point D and a labyrinth ring outlet pressure measuring point E.
3. The pump turbine roof bolt stress monitoring system of claim 1 or 2, characterized in that: the top cover pressure measurement module comprises a measuring head and pressure sensors which are in one-to-one correspondence with each key measuring point, wherein the measuring head is arranged at the position of the corresponding measuring point, and a pipeline for leading pressurized water to the pressure sensors is arranged between the measuring head and the corresponding pressure sensors.
4. The pump turbine roof bolt stress monitoring system of claim 1, characterized in that: the top cover bolt stress measuring module is provided with an ultrasonic probe arranged on the top cover bolt and an ultrasonic transmitting and signal collecting device electrically connected with the ultrasonic probe.
5. The pump turbine roof bolt stress monitoring system of claim 4, characterized in that: the ultrasonic probe is arranged at the upper end of the top cover bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211518114.6A CN115855351A (en) | 2022-11-30 | 2022-11-30 | Stress monitoring system for water pump turbine top cover bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211518114.6A CN115855351A (en) | 2022-11-30 | 2022-11-30 | Stress monitoring system for water pump turbine top cover bolt |
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| Publication Number | Publication Date |
|---|---|
| CN115855351A true CN115855351A (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211518114.6A Pending CN115855351A (en) | 2022-11-30 | 2022-11-30 | Stress monitoring system for water pump turbine top cover bolt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117990797A (en) * | 2024-04-07 | 2024-05-07 | 国网新源集团有限公司 | Crack detection method for large-sized water turbine runner coupling bolt |
-
2022
- 2022-11-30 CN CN202211518114.6A patent/CN115855351A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117990797A (en) * | 2024-04-07 | 2024-05-07 | 国网新源集团有限公司 | Crack detection method for large-sized water turbine runner coupling bolt |
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