Method for monitoring vibration of bearing bush of thermal power plant

Abstract

The invention relates to the technical field of bearing bush vibration monitoring, in particular to a thermal power plant bearing bush vibration monitoring method, which comprises the following steps of: forming holes in the vertical and horizontal directions of a front bearing box, a middle bearing box and a rear bearing box of a unit; a stainless steel probe is inserted into the hole, and the stainless steel probe is in contact with a bearing bush in the bearing box; and performing vibration monitoring on the outer end of the stainless steel probe. According to the utility model, the stainless steel probe is arranged on the bearing box of the thermal power plant unit, so that the real-time on-line monitoring of the vibration of the bearing bush is realized, and the operation safety and reliability of equipment are obviously improved. According to the method, a threaded hole is formed in the bearing box, and threads are arranged on the outer wall of the stainless steel probe, so that stable threaded connection of the probe and the bearing box is realized, firm installation of the probe is ensured, the sealing performance of the bearing box is enhanced, and leakage of lubricating oil and invasion of external pollutants are effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of bearing vibration monitoring, and in particular to a method for bearing vibration monitoring in a thermal power plant. Background Art

[0002] Our factory's Mitsubishi M701F5 gas turbine is combined with a LZN352-16.0 / 585 / 585 steam turbine to form a two-on-one gas-fired cogeneration unit. This unit has certain limitations in design, especially in the aspect of bearing vibration monitoring.

[0003] At present, the bearings of this type of steam turbine units are all arranged in the bearing box, and the bearing box is designed as a sealed bearing box that operates under negative pressure. Although this design helps to improve the sealing and safety of the unit, it also brings challenges in monitoring. Since the bearings are located inside the bearing box, traditional monitoring methods such as stethoscopes and vibration monitoring equipment cannot be directly applied to the measurement of bearing vibration.

[0004] In terms of bearing vibration monitoring, although the 3-7 watt units all have bearing vibration measurement points to monitor the bearing vibration of the unit, the units are not designed with bearing vibration monitoring. This means that during the operation of the unit, the operating status of the bearing cannot be monitored in real time, and possible abnormal situations such as bearing wear and damage cannot be discovered and handled in time, which may lead to reduced unit efficiency or even failure.

[0005] In addition, there is a certain relationship between the vibration of the bearing and the vibration of the bearing. The vibration of the bearing, that is, the vibration of the bearing seat, is based on the peak-to-peak value of the vibration of the bearing seat supporting the rotor as the evaluation scale, while the shaft vibration, that is, the vibration of the rotating shaft, is divided into relative vibration and absolute vibration. At present, the shaft vibration is mostly measured by eddy current sensors to measure the relative vibration value of the rotor; the absolute value measured by the speed and acceleration sensors, that is, the bearing vibration, is used to monitor the operating status of the rotating equipment. However, due to the lack of bearing vibration monitoring, this monitoring method has limitations in practical applications.

[0006] In view of the above problems, the prior art urgently needs an improved monitoring method to achieve effective monitoring of bearing vibration, thereby improving the operating safety and reliability of the gas-fired cogeneration unit. Summary of the invention

[0007] In view of the above problems existing in the existing refrigerated high-ultraviolet aging test box, the present invention is proposed.

[0008] Therefore, the purpose of the present invention is to provide a refrigerated high-UV aging test box, which aims to solve these limitations in the prior art and achieve real-time monitoring of bearing vibration through innovative monitoring technology to optimize the operation and maintenance of the unit.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: A method for monitoring the vibration of bearings in a thermal power plant, comprising the following steps:

[0010] By opening holes in the vertical and horizontal directions of the front, middle and rear bearing boxes of the unit;

[0011] A stainless steel probe is inserted into the hole, and the stainless steel probe contacts the bearing bush in the bearing housing;

[0012] Vibration monitoring of the outer end of the stainless steel probe.

[0013] As a preferred solution of the coolable high-ultraviolet aging test box of the present invention, a threaded hole is provided on the bearing box, a thread is provided on the outer wall of the stainless steel probe, and the stainless steel probe is screwed to the threaded hole.

[0014] As a preferred solution of the coolable high-ultraviolet aging test box of the present invention, a stainless steel probe perpendicular to the side surface is inserted into the side and top surface of each bearing shell.

[0015] As a preferred solution of the coolable high-ultraviolet aging test box described in the present invention, the stainless steel probe is plugged in horizontally or vertically, and one end of the stainless steel probe is in contact with the bearing pillow shell.

[0016] As a preferred solution of the refrigerated high-ultraviolet aging test box described in the present invention, intermittent vibration monitoring is performed by contacting a handheld vibration analysis instrument with the outer ends of each stainless steel probe for detection one by one, and manually recording and analyzing to achieve monitoring.

[0017] As a preferred solution of the refrigerated high-ultraviolet aging test box described in the present invention, wherein: the handheld vibration analysis instrument is the CX10 of Bicce or the vibration analysis instrument of Bentley.

[0018] As a preferred solution of the coolable high-ultraviolet aging test box of the present invention, a vibration sensor is installed on the outer end of the stainless steel probe, and each vibration sensor is connected to a processor to form a real-time online monitoring system.

[0019] As a preferred solution of the refrigerated high-UV aging test box described in the present invention, the real-time online monitoring system includes multiple vibration sensors for collecting vibrations of rusted steel probes, a processor for processing the collected vibration data, a memory for storing the processed data, and a touch screen for human-computer interaction.

[0020] As a preferred solution of the refrigerated high-ultraviolet aging test box described in the present invention, the vibration sensor and the processor are both provided with a data transmission module, which performs data transmission by wired or wireless means, including network communication, field bus, Bluetooth, WiFi, and GPRS.

[0021] As a preferred solution of the refrigerated high-UV aging test box described in the present invention, the process of the processor processing vibration data involves the following multiple steps, mainly including data acquisition, signal processing, feature extraction, data analysis and data visualization.

[0022] Beneficial effects of the invention: This patent realizes real-time online monitoring of bearing vibration by installing a stainless steel probe on the bearing box of the thermal power plant unit, significantly improving the operating safety and reliability of the equipment. Specifically, this method realizes stable screw connection between the probe and the bearing box by opening a threaded hole on the bearing box and setting a thread on the outer wall of the stainless steel probe, which not only ensures the firm installation of the probe, but also enhances the sealing performance of the bearing box, effectively preventing lubricating oil leakage and external pollutants from invading. This design makes the collection of vibration data more accurate, helps to timely detect abnormal conditions of bearings, such as fatigue spalling, deformation, etc., prevent bearing overheating and equipment failure, reduce downtime and maintenance costs, and improve power generation efficiency. In addition, the vibration data is collected, transmitted and stored in real time by the collection device, and the feature information is extracted by using signal processing technology, combined with the fault diagnosis algorithm, to achieve early fault warning, further ensuring the safe and stable operation of the thermal power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the position of the stainless steel probe in the front bearing box of the present invention.

[0025] Figure 2 Schematic diagram of the position of the stainless steel probe in the bearing box of the present invention.

[0026] Figure 3 It is a schematic diagram of the position of the stainless steel probe in the rear bearing box of the present invention. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0031] Example 1

[0032] Reference Figure 1 , which is the first embodiment of the present invention, provides a method for monitoring the vibration of bearings in a thermal power plant, comprising the following steps: opening holes in the vertical and horizontal directions of the front, middle and rear bearing boxes of the unit; inserting stainless steel probes into the holes, and the stainless steel probes are in contact with the bearings in the bearing boxes; and monitoring the vibration of the outer ends of the stainless steel probes.

[0033] This application realizes real-time monitoring of bearing vibration by installing stainless steel probes at key parts of the unit. The following is an explanation of this method and its effect:

[0034] Drill holes to install probes: Drill holes in the vertical and horizontal directions of the front, middle and rear bearing boxes of the unit. These holes are used to insert stainless steel probes. This design allows the probes to directly contact the bearing shells, thereby accurately capturing the vibration data of the bearing shells. The selection of the location of the holes is crucial to ensuring the accuracy and comprehensiveness of the monitoring data.

[0035] Use of stainless steel probe: The stainless steel probe is inserted into the bearing housing and contacts the bearing shell. Stainless steel is selected because of its good corrosion resistance and strength, and its ability to maintain stability and durability in harsh industrial environments. The direct contact of the probe can provide more accurate vibration data, which is very important for subsequent data analysis and fault diagnosis.

[0036] Vibration monitoring: The outer end of the stainless steel probe is used for vibration monitoring. The sensor unit used here is a direct sensing component for obtaining the bearing vibration parameters. The bearing vibration signal is converted into an electrical signal to sense the bearing vibration state. In this way, the vibration of the bearing can be monitored in real time, and abnormal vibration can be detected in time, thereby preventing potential equipment failures.

[0037] The effect of this method is that it can realize real-time online monitoring of bearing vibration, improve the operating safety and reliability of thermal power plant equipment. By monitoring the vibration of the bearing, abnormal conditions of the bearing, such as fatigue spalling, deformation, indentation and local corrosion, can be discovered in time, which helps prevent bearing overheating, avoid failures, reduce downtime and maintenance costs, and improve power generation efficiency.

[0038] Data analysis and fault diagnosis: The collected vibration data is transmitted and stored in real time through an electronic data acquisition device, and then signal processing technology is used to extract characteristic information from the data. For example, Fourier spectrum analysis can be used to determine the state of the bearing. The fault diagnosis algorithm is used to analyze the extracted characteristic information, identify the abnormal state of the bearing, and provide early fault warning.

[0039] In summary, this bearing vibration monitoring method achieves accurate monitoring of bearing vibration by directly installing a stainless steel probe in the bearing housing, which helps to promptly detect and deal with potential equipment problems, thereby ensuring the safe and stable operation of the thermal power plant.

[0040] A threaded hole is provided on the bearing box, and a thread is provided on the outer wall of the stainless steel probe, and the stainless steel probe is screwed to the threaded hole. This design not only ensures the stable installation of the stainless steel probe, but also enhances the sealing performance of the bearing box, which is of great significance for maintaining the stability of the internal environment of the bearing box and extending the service life of the equipment.

[0041] It has two main functions and effects: (1) Installation and fixation: The design of the threaded hole allows the stainless steel probe to be fixed to the bearing box by threaded connection. This fixing method utilizes the mechanical advantage of the thread, that is, fixed connection is achieved by screwing. The threaded connection has the characteristics of simple structure, reliable performance, easy disassembly, and easy manufacturing. In this way, the stainless steel probe can be firmly installed on the bearing box to ensure that it will not loosen or fall off due to vibration during the operation of the equipment.

[0042] (2) Avoid leakage and ensure sealing: Another important function of threaded connection is to prevent leakage and ensure the sealing of the bearing box. The bearing box needs to withstand a certain pressure and temperature, so its sealing is crucial to preventing lubricating oil leakage and external contaminants from invading. By setting threads on the outer wall of the stainless steel probe and matching them with the threaded holes on the bearing box, a tight threaded connection can be achieved, thereby effectively preventing the leakage of liquid and gas. This connection method is similar to the stud connection in mechanical design. One end is screwed into a part with an internal threaded hole, and the other end passes through a part with a through hole, and then a nut is screwed on. Even if the two parts are fastened together as a whole, this design helps to keep the inside of the bearing box clean and the lubricating oil pure, thereby extending the service life of the bearing.

[0043] See also Figures 1 to 3 Among them, 8 stainless steel probes are set at 4 bearings in the front, middle and rear bearing boxes. A stainless steel probe perpendicular to it is inserted into the side and top surface of each bearing shell, and the stainless steel probe is inserted horizontally or vertically, and one end of it is in contact with the bearing shell, as shown in the figure.

[0044] The thermal power plant bearing vibration monitoring method monitors the bearing vibration by plugging stainless steel probes on the side and top of the bearing. The specific details are as follows: a stainless steel probe perpendicular to the side and top of each bearing is plugged in. This arrangement ensures that the vibration of the bearing is monitored from different directions, thereby obtaining comprehensive vibration data. The specific stainless steel probe can be plugged into the bearing horizontally or vertically, with one end of the probe fitting the bearing pillow shell. This installation method enables the probe to directly sense the vibration of the bearing and provide accurate vibration signals. Stainless steel is used as the probe because it has excellent corrosion resistance and strength, and can maintain stability and durability in harsh industrial environments. By monitoring the vibration of the outer end of the stainless steel probe, the vibration data of the bearing can be captured in real time. These data are crucial for analyzing the operating status of the bearing and preventing potential failures. The effect of this method is that it can realize real-time monitoring of the vibration of the bearing and improve the operating safety and reliability of the equipment. By monitoring the vibration of the bearing, abnormal conditions of the bearing, such as fatigue spalling, deformation, indentation and local corrosion, can be discovered in time, thereby preventing bearing overheating problems, avoiding failures, reducing downtime and maintenance costs, and improving power generation efficiency.

[0045] Example 2

[0046] Reference Figure 1 , which is the second embodiment of the present invention, and this embodiment is different from the first embodiment in that: a handheld vibration analysis instrument of Bikece CX10 or Bentley is brought into contact with the outer end of the stainless steel probe for intermittent vibration monitoring.

[0047] Handheld vibration detectors, such as the CX10 from Bicester or the Bentley Vibration Analyzer, provide a portable and flexible monitoring method. The small size and light weight of handheld vibration detectors make it easy for engineers to carry them to the monitoring site for on-site testing at any time. This portability not only saves time, but also improves work efficiency, especially when monitoring in hard-to-reach areas. Its convenience is particularly obvious, allowing engineers to easily perform rapid testing and diagnosis of equipment at the monitoring site. These instruments obtain vibration data from the equipment by directly contacting the outer end of the stainless steel probe, sensing the vibration of the probe and converting it into a digital signal. Although this intermittent monitoring method is simple, it is not as timely as continuous monitoring because it relies on regular manual inspections to collect data. Handheld vibration detectors usually have intuitive vibration spectrograms and spectrum analysis functions to help engineers determine the working status and health of the equipment and find out the cause of abnormal vibration. Some advanced handheld vibration detectors also have security and robustness, and wireless connection between the controller and the data processor is realized through Bluetooth communication, allowing data collectors to operate at a safe distance. In addition, they may also have large-capacity data storage capabilities and USB data transfer functions to facilitate subsequent analysis and comparison. Although handheld vibration detectors provide effective on-site vibration detection and certain fault diagnosis capabilities, they are still a monitoring method based on manual operation and may not be able to achieve real-time and continuous monitoring.

[0048] The remaining structures are the same as those of Example 1.

[0049] Example 3

[0050] Reference Figure 1 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the real-time online monitoring system includes a plurality of vibration sensors for collecting vibrations of the rusted steel probe, a processor for processing the collected vibration data, a memory for storing the processed data, and a touch screen for human-computer interaction.

[0051] One of the core components of the real-time online monitoring system is the vibration sensor, which is used to collect vibration data of the stainless steel probe. These sensors can convert physical quantities (vibration and displacement) into electrical signal outputs based on different sensing mechanisms, such as piezoelectric effect, capacitance change or optical interference. The vibration sensor needs to have high accuracy and high resolution to capture small vibration changes, as well as fast response capability and good stability and reliability. In this system, vibration sensors will be installed at key locations to monitor the vibration status of the equipment in real time and detect potential faults in a timely manner.

[0052] The processor is the brain of the system and is responsible for processing the collected vibration data. It receives the signal from the vibration sensor and performs necessary signal conditioning, such as amplification, filtering, and analog-to-digital conversion (if the sensor output is an analog signal). The processor also needs to execute data analysis algorithms to extract valuable information, such as characteristic frequency, vibration amplitude, etc., to facilitate subsequent fault diagnosis and status monitoring.

[0053] Memory is used to store processed data and analysis results. This can be short-term cache storage, used to temporarily store data for real-time processing, or long-term database storage, used to store historical data and trend analysis. The choice of memory needs to consider the data read and write speed, capacity, and data retention requirements.

[0054] The human-machine interface (HMI) is the bridge of communication between the system and the user. In this system, the touch screen HMI will provide an intuitive graphical interface, allowing users to interact with the machine through touch operations. The touch screen HMI will display real-time monitoring data, historical trends, alarm information, etc., and users can use it to set parameters, diagnose faults, and configure the system. The hardware part of the touch screen HMI includes a microprocessor, storage device, input and display module, communication port, etc., while the software part is responsible for providing an intuitive graphical interface and interactive capabilities.

[0055] The data transmission module is responsible for transmitting the data collected by the sensor from the field to the processor or data center. This can be done through wired or wireless methods, including network communication, fieldbus, Bluetooth, WiFi, GPRS, etc. The data transmission module needs to ensure the real-time, integrity and security of the data. The data transmitted to the processor or cloud is processed and analyzed to extract valuable information. Data analysis can analyze and evaluate the operating status of the equipment through real-time monitoring, model prediction, fault diagnosis and other means.

[0056] Among them: the process of the processor processing vibration data involves multiple steps, mainly including data acquisition, signal processing, feature extraction, data analysis and data visualization. The following is a detailed processing flow: the processor first receives the raw vibration data from the vibration sensor. These data may contain noise and outliers and need to be cleaned to improve data quality. The cleaned data is analyzed in time domain and frequency domain. The time domain analysis focuses on the amplitude, frequency, phase and other parameters of the signal, while the frequency domain analysis converts the time domain signal into a frequency domain signal through the fast Fourier transform (FFT) to reveal the frequency components in the data. Through signal processing, the key features of the vibration signal, such as peak value, mean value, frequency distribution, etc., are extracted. These features are crucial for subsequent fault diagnosis and equipment status monitoring. The extracted features are used for in-depth analysis to identify the operating status and potential problems of the equipment. This may include vibration modal analysis, structural response analysis, etc., to calculate the structure in different The response characteristics under certain conditions, such as displacement, velocity, acceleration, etc., some advanced processors can automatically adjust the gain of the amplifier according to the amplitude change of the measured signal, so that the system has a wider adaptability. This adaptive gain control function can improve the accuracy of the measurement and ensure the accurate acquisition of the signal. For data that needs to be transmitted through the network, a high-fidelity data compression algorithm is used to reduce the amount of data to meet the technical requirements of network transmission and improve the refresh speed when remotely browsing the real-time data of the unit. The processor stores the processed data in the memory to facilitate the analysis of historical data and trend monitoring. Finally, the processed data is visualized, and graphs such as response curves, modal spectra, and structural dynamic characteristics are drawn to intuitively observe and analyze the monitoring results of the structure.

[0057] Through the collaborative work of the above components, the real-time online monitoring system can provide users with a comprehensive, real-time equipment status monitoring and analysis platform, thereby improving the operating safety and reliability of the equipment.

[0058] The remaining structure is the same as that of Example 2.

[0059] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only several embodiments are described in detail in this disclosure, it should be easily understood by the personnel referring to this disclosure that many modifications are possible (for example, the size, scale, structure, shape and ratio of various elements, and parameter values ​​(for example, temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method step can be changed or reordered according to the alternative embodiment. Any "device plus function" clause is intended to cover the structure of the execution of the function described in this article, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiment. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0060] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for monitoring bearing vibration in a thermal power plant, characterized in that: The following steps are included: By opening holes in the vertical and horizontal directions of the front, middle and rear bearing boxes of the unit; A stainless steel probe is inserted into the hole, and the stainless steel probe contacts the bearing bush in the bearing housing; Vibration monitoring of the outer end of the stainless steel probe.

2. The method for monitoring bearing vibration in a thermal power plant according to claim 1, characterized in that: A threaded hole is provided on the bearing box, and a thread is provided on the outer wall of the stainless steel probe, and the stainless steel probe is screwed to the threaded hole.

3. The method for monitoring bearing vibration in a thermal power plant according to claim 2, characterized in that: A stainless steel probe perpendicular to the side surface is inserted into the side and top surface of each bearing shell.

4. The method for monitoring bearing vibration in a thermal power plant according to claim 1, characterized in that: The stainless steel probe is plugged in horizontally or vertically, and one end thereof fits in with the bearing pillow shell.

5. The method for monitoring bearing vibration in a thermal power plant according to claim 1, characterized in that: Intermittent vibration monitoring is achieved by using a handheld vibration analyzer, which is placed in contact with the outer ends of each stainless steel probe for detection one by one, and manual recording and analysis are performed to achieve monitoring.

6. The method for monitoring bearing vibration in a thermal power plant according to claim 5, characterized in that: The handheld vibration analysis instrument is the CX10 produced by BEC or the vibration analysis instrument produced by Bentley.

7. The method for monitoring bearing vibration in a thermal power plant according to claim 1, characterized in that: A vibration sensor is installed on the outer end of the stainless steel probe, and each vibration sensor is connected to a processor to form a real-time online monitoring system.

8. The method for monitoring bearing vibration in a thermal power plant according to claim 7, characterized in that: The real-time online monitoring system includes a plurality of vibration sensors for collecting vibrations of the rusted steel probe, a processor for processing the collected vibration data, a memory for storing the processed data, and a touch screen for human-computer interaction.

9. The method for monitoring bearing vibration in a thermal power plant according to claim 8, characterized in that: The vibration sensor and the processor are both provided with a data transmission module, which performs data transmission via wired or wireless means, including network communication, field bus, Bluetooth, WiFi, and GPRS.

10. The method for monitoring bearing vibration in a thermal power plant according to claim 9, characterized in that: The process of processing vibration data by the processor involves the following multiple steps, mainly including data acquisition, signal processing, feature extraction, data analysis and data visualization.

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