Active damping regulation and control system of integral squeeze film damper

Abstract

The invention discloses an active damping regulation and control system of an integral squeeze film damper, and belongs to the technical field of vibration control of rotary machinery. The system comprises a rotor system, a data acquisition system, a lubrication system and a control system. In the process of starting and working condition changing of a rotating mechanical rotor in the rotor system, the rotating speed of the rotor changes continuously, vibration changes along with working condition changes, and a data collection system collects rotating speed and vibration data of the rotor and then transmits the data to a control system. The control system is used for actively controlling and adjusting the oil supply pressure of the lubricating system on the integral type extrusion oil film damper, active regulation and control of damping of the integral type extrusion oil film damper are achieved, and vibration of the rotor system is controlled and reduced through damping force. By means of the method, the rotor system can be kept at the low vibration level within the full rotating speed range, waste of lubricating oil of the rotor lubricating system can be reduced, and the economic cost of the rotor system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration control of rotating machinery, and particularly to an active damping regulation system for an integral squeeze film damper. Background Art

[0002] With the progress of technology and the improvement of industry requirements, it is required that the operating conditions of impeller rotating machinery such as steam turbines, gas turbines, and compressors are more complex and changeable, and the working environment of components is more severe. Therefore, the problem of vibration becomes more prominent. The problem of excessive vibration seriously reduces the operating quality and production efficiency of rotating machinery such as steam turbines and gas turbines. In severe cases, it even causes the unit to malfunction and trigger serious safety accidents.

[0003] As a new type of damper, the integral squeeze film damper (ISFD) has a unique segmented oil film design that effectively solves the non-linearity problem of traditional dampers and can provide a large damping for the rotor system. The damping coefficient of the damper is related not only to the structural parameters of the damper but also to the supply oil pressure of the damper. However, abroad, the damper is only used as a fitting of the bearing and is used as a maintenance and remedial measure when the vibration of the whole steam turbine or gas turbine exceeds the standard. Usually, the lubrication system of the bearing is used to supply oil to the damper, which increases the design difficulty of the damper. Too low supply oil pressure results in a low damping coefficient of the damper and sometimes cannot solve the problem of excessive vibration of the rotor. At this time, it is necessary to redesign the damper or take other vibration reduction measures, which will prolong the maintenance cycle of the unit and thus cause economic losses. Too high supply oil pressure leads to a large load on the lubrication system and waste of lubricating oil.

[0004] In order to solve the problems such as insufficient vibration control ability of the damper caused by the supply oil pressure, a lubrication system is separately provided for the damper, and the pressure of the lubricating medium is actively regulated to realize the real-time adjustment of the damping coefficient of the damper according to the working conditions, so as to ensure that the rotor system maintains a low vibration level under different working conditions, effectively avoid unnecessary loss of lubricating oil, reduce the working burden of the lubrication system, and thus prolong its service life. Summary of the Invention

[0005] To achieve the above object, the present invention provides an active damping regulation system for an integral squeeze film damper, which includes a rotor system, a data acquisition system, a control system, and a lubrication system. The rotor system includes a rotating machinery rotor, bearings, and bearing seats supporting both ends of the rotating machinery rotor. An integral squeeze film damper is arranged between the bearings and the bearing seats, and the integral squeeze film damper is connected to the lubrication system for providing a lubricating medium;

[0006] After the data acquisition system collects the rotational speed and vibration data of the mechanical rotor, it transmits the data to the control system. The control system is connected to the lubrication system, and the control system can control the oil supply pressure of the lubrication system, thereby realizing the active adjustment of the damping of the integral squeeze film damper.

[0007] Preferably, the data acquisition system includes a rotational speed sensor and an eddy current sensor. The rotational speed sensor and the eddy current sensor are respectively fixedly installed at the input end of the rotating mechanical rotor and are electrically connected to the control system. The eddy current sensor for collecting vibration data transmits an electrical signal to the control system.

[0008] Preferably, the control system includes a PLC and an inverter for processing rotational speed and vibration data. The control system is electrically connected to the lubrication system through the inverter to realize the active control of the lubrication system.

[0009] Preferably, a threshold for controlling the oil supply pressure of the lubrication system is set in the control system.

[0010] Preferably, the PLC realizes the start-stop control of the lubrication system according to the comparison between the rotational speed and vibration data and the threshold.

[0011] Preferably, the lubrication system is connected to the integral squeeze film damper by an independent oil supply circuit, making it independent of the lubrication of the bearing.

[0012] Preferably, it further includes a motor, and the motor is connected to the input end of the rotating mechanical rotor through a coupling.

[0013] Therefore, compared with the prior art, the present invention has the following beneficial effects;

[0014] (1) Starting from the vibration problem of the rotating machinery, the present invention adds an independent oil supply system to the integral squeeze film damper, and separately adds an oil supply system to the integral squeeze film damper, reducing the design difficulty of the integral squeeze film damper.

[0015] (2) In the present invention, the data acquisition system can collect the vibration and rotational speed of the rotor system, and the control system can actively control the lubrication system based on the collected data, that is, automatically adjust according to the actual situation, can collect data to decide the start-stop of the lubrication system and the size of the oil supply pressure, and realize the active control of the damping force of the integral squeeze film damper, so that when the vibration of the rotating mechanical rotor is large, the integral squeeze film damper provides high damping to dissipate vibration energy, and when the vibration of the rotor is low, the integral squeeze film damper can reduce the load of the lubrication system through low oil supply pressure, reduce the waste of lubricating medium, and reduce the use cost.

[0016] (3) Compared with the case of not using an integral squeeze film damper and not using an active control system, the use of an active control system can significantly reduce the rotor vibration at each rotational speed, ensuring that the rotor vibration remains at a low level throughout the entire rotational speed range. This can effectively solve the vibration problem of the rotating machinery rotor and ensure its excellent performance.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the active damping regulation system for the integral squeeze film damper of the present invention;

[0019] Figure 2 Schematic diagram of the structure of the integral squeeze film damper in the present invention;

[0020] Figure 3 Graph showing the relationship between the oil supply pressure and damping of the integral squeeze film damper in the present invention;

[0021] Figure 4 Flow control schematic diagram of the active damping regulation system for the integral squeeze film damper of the present invention;

[0022] Figure 5 Comparison detection results of rotor vibration after adopting the active damping regulation system for the integral squeeze film damper of the present invention.

[0023] Reference Numerals:

[0024] 1. Integral squeeze film damper; 2. Rotor system; 21. Rotating machinery rotor; 22. Bearing; 23. Bearing housing; 3. Lubrication system; 4. Control system; 41. PLC; 42. Frequency converter; 5. Data acquisition system; 51. Rotational speed sensor; 52. Eddy current sensor; 6. Motor; 7. Coupling. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0027] Embodiment

[0028] Please refer to Figure 1 is a schematic diagram of the active damping control system of the integral squeeze film damper of the present invention. Figure 2 is a schematic diagram of the structure of the integral squeeze film damper in the present invention. The control system includes a rotor system 2, a data acquisition system 5, a control system 4, and a lubrication system 3. The rotor system 2 includes a rotating machinery rotor 21, bearings 22, and bearing housings 23 supported at both ends of the rotating machinery rotor 21. An integral squeeze film damper 1 is provided between the bearings 22 and the bearing housings 23. The integral squeeze film damper 1 is connected to a lubrication system 3 for providing a lubricating medium. Among them, the damping characteristics of the integral squeeze film damper 1 are related to the structural parameters and the oil supply pressure. The relationship between the damping and the oil supply pressure is as Figure 3As shown, the lubrication system 3 is connected to the integral squeeze film damper 1 by an independent oil supply circuit and can supply oil to it radially or axially. The oil supply pressure of the lubrication system 3 can be regulated by the control system 4 to achieve automatic control of the damping of the integral squeeze film damper 1. Adding an independent lubrication system 3 to the integral squeeze film damper 1 and separately adding a lubrication system 3 and variable damping characteristics to the integral squeeze film damper 1 reduce the design difficulty of the integral squeeze film damper 1. The variable damping characteristics reduce the design difficulty of the integral squeeze film damper 1. The data acquisition system 5 includes a speed sensor 51 and an eddy current sensor 52. The speed sensor 51 and the eddy current sensor 52 are respectively fixedly installed at the input end of the rotating machinery rotor 21 and electrically connected to the control system 4, and the eddy current sensor 52 for collecting vibration data and the speed sensor 51 for collecting speed data respectively transmit electrical signals to the control system 4. The control system 4 includes a PLC 41 and an inverter 42 (not shown in the figure) for processing speed and vibration data. The control system 4 is electrically connected to the lubrication system 3 through the inverter 42 to achieve active regulation of the lubrication system 3. In this embodiment, Mitsubishi PLC 41 is used in the control system 4 to process data, and the lubrication system 3 is regulated according to the vibration data and speed data collected by the data acquisition system 5, that is: the start and stop of the lubrication system 3 are controlled by the inverter 42 in the control system 4, and the oil supply pressure of the integral squeeze film damper 1 is increased or decreased. The regulation system also includes a motor 6, and the motor 6 is connected to the rotating machinery rotor 21 in the rotor system 2 through a coupling 7.

[0029] Please refer to Figure 4This is the flow control schematic diagram of the active damping regulation system for the integral squeeze film damper of the present invention. The working principle of this regulation system is as follows: First, the rotational speed sensor 51 and the eddy current sensor 52 of the data acquisition system 5 can transmit the rotational speed and vibration data of the rotating machinery rotor 21 to the control system 4. At the same time, the control system 4 can actively control the lubrication system 3 based on the data collected by the data acquisition system 5. A threshold for controlling the oil supply pressure of the lubrication system 3 is set in the control system 4, and the rated power of the lubrication system 3 under various working conditions of the rotor system 2 is set according to the dynamic characteristic analysis of the rotor system 2. When the working condition of the rotor changes, the control system 4 adjusts the oil supply pressure of the lubrication system 3 to the set pressure corresponding to the working condition according to the change of the collected rotor rotational speed data. Then, the control system 4 evaluates the vibration level of the rotor according to the vibration data collected by the data acquisition system 5. When the vibration level is higher than the highest threshold, the oil supply pressure of the lubrication system 3 is increased to increase the damping provided by the integral squeeze film damper 1 for the rotor system 2 and reduce the vibration of the rotor system 2. When the vibration level is lower than the lowest threshold, the oil supply pressure of the lubrication system 3 is reduced to reduce the damping provided by the integral squeeze film damper 1 for the rotor system 2, reduce the energy dissipation capacity of the damper for the rotor system 2, reduce the energy waste of the rotor system 2, and reduce the load of the lubrication system 3. When operating under low load conditions, the lubrication system 3 is turned off to reduce the waste of lubricating medium and the operating cost of the lubrication system 3.

[0030] Please refer to Figure 5 This is the comparison detection result of rotor vibration after the present invention adopts the active damping regulation system for the integral squeeze film damper. As can be seen from the figure, when the integral squeeze film damper 1 and the active control system 4 are not adopted, the rotor amplitude increases significantly. On the contrary, when the active control system 4 is used, the rotor vibration at each rotational speed can be significantly reduced, ensuring that the rotor has a low vibration level and excellent performance throughout the rotational speed range, and effectively solving the vibration problem of the rotating machinery rotor 21.

[0031] Therefore, the present invention first designs a lubrication system specifically for the integral squeeze film damper, making it independent of the lubrication system of the bearing. And a data acquisition system and a control system are added. The data acquisition system can collect the vibration and rotational speed of the rotor system. The control system actively regulates the lubrication system based on the collected vibration and rotational speed data, and makes independent decisions on the start-stop of the lubrication system and the power of the lubrication system. The active damping regulation system for the integral squeeze film damper enables the integral squeeze film damper to have variable damping characteristics, reduces the design difficulty of the integral squeeze film damper, keeps the rotor at a low vibration level throughout the rotational speed range, reduces the load of the lubrication system and the energy waste of the rotor system.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the present invention or make equivalent replacements, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. The active damping control system of the integral squeeze film damper is characterized by: It comprises a rotor system, a data acquisition system, a control system and a lubrication system, wherein the rotor system comprises a rotary mechanical rotor, a bearing and a bearing seat supported at both ends of the rotary mechanical rotor, an integral squeeze film damper is arranged between the bearing and the bearing seat, and the integral squeeze film damper is connected to the lubrication system for providing a lubricating medium; After collecting the rotational speed and vibration data of the mechanical rotor, the data acquisition system transmits the data to the control system. The control system is connected to the lubrication system. The control system can control the oil supply pressure of the lubrication system, thereby realizing active adjustment of the damping of the integral squeeze film damper.

2. The active damping control system of the integrated squeeze film damper according to claim 1, characterized in that: The data acquisition system includes a speed sensor and an eddy current sensor. The speed sensor and the eddy current sensor are respectively fixedly installed at the input end of the rotating machinery rotor and are electrically connected to the control system. The eddy current sensor for collecting vibration data transmits electrical signals to the control system.

3. The active damping control system of the integrated squeeze film damper according to claim 1, characterized in that: The control system includes a PLC and a frequency converter for processing rotation speed and vibration data. The control system is electrically connected to the lubrication system through the frequency converter to achieve active regulation of the lubrication system.

4. The active damping control system of the ISFD according to claim 3 is characterized in that: The control system is provided with a threshold value for controlling the oil supply pressure of the lubrication system.

5. The active damping control system of the ISFD according to claim 3, characterized in that: The PLC implements start and stop control of the lubrication system based on comparison of the rotation speed and vibration data with the threshold value.

6. The active damping control system of the ISFD according to claim 1, characterized in that: The lubrication system adopts an independent oil supply circuit to be connected with the integrated squeeze film damper, so that it is independent of the lubrication of the bearing.

7. The active damping control system of the ISFD according to claim 1, characterized in that: It also includes a motor, which is connected to the input end of the rotor of the rotating machine through a coupling.

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