CN221257518U - Vibration damper for rod power supply unit of nuclear power plant - Google Patents
Vibration damper for rod power supply unit of nuclear power plant Download PDFInfo
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- CN221257518U CN221257518U CN202322427361.1U CN202322427361U CN221257518U CN 221257518 U CN221257518 U CN 221257518U CN 202322427361 U CN202322427361 U CN 202322427361U CN 221257518 U CN221257518 U CN 221257518U
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Abstract
The application discloses a vibration damper of a nuclear power plant bar power unit, which comprises a counterweight mass block, a sliding guide rail, a bottom plate, a spring module and a locking/fine tuning module, wherein the counterweight mass block is arranged on the bottom plate; the bottom plate and the sliding guide rail are arranged in parallel up and down, the middle is hollow, the first end of the bottom plate is connected with the front end of the sliding guide rail through the hinge module, and the second end of the bottom plate is connected with the rear end of the sliding guide rail through the spring module; the counterweight mass block is arranged above the sliding guide rail, is connected with the sliding guide rail in a sliding manner and slides back and forth along the sliding guide rail; the locking/fine tuning module is positioned between the counterweight mass and the sliding guide rail and is used for adjusting or fixing the position of the counterweight mass relative to the sliding guide rail. After the vibrating machine set is put into operation, the vibration of the rod power machine set is effectively reduced, the vibration of the rod power machine set is reduced to an ideal level, a floor foundation is protected, and the operation reliability of equipment is improved.
Description
Technical Field
The application relates to the technical field of vibration of rotating equipment, in particular to a vibration damper of a rod power unit of a nuclear power plant.
Background
The nuclear power plant bar power unit is typically composed of 2 motor-generator units, as shown in fig. 1, whose function is to ensure continuous power to the control bar drive mechanism. The normal vibration can be generated in the starting process of the rod power unit, the standard vibration amplitude is generally less than or equal to 2.8mm/s, when the starting vibration is overlarge and exceeds the standard vibration amplitude, the unit can not be started normally easily, and the safety and stability operation of the nuclear power plant are greatly jeopardized. If the manpower and time are increased to repair so as to reduce the vibration problem of the bar power unit, the long repair period is easy to prolong, the repair cost is increased, and the generating capacity of the unit is lost. In order to eliminate the defect, operation and maintenance personnel try to implement various solutions in the past overhaul process, vibration is damped by carrying out on-site dynamic balance on a unit, arranging a temporary support to increase the floor foundation strength, optimally adjusting the center of a generator and a motor (namely, the optimal coaxiality and parallelism of data are all required to be less than or equal to 0.03mm at present), arranging a vibration damping sand bag and the like, and although the vibration can be reduced to a certain extent, the effect is still not obvious, and the hidden danger of high vibration during the running of equipment cannot be radically eliminated.
Disclosure of Invention
The utility model aims to develop a vibration damper of a rod power unit of a nuclear power plant, which can ensure that vibration of the rod power unit in the working conditions of single start, double start, start test, formal operation and the like can meet standard requirements (less than or equal to 2.8 mm/s) through installation and use of the vibration damper, and ensure safe and reliable operation of the rod power unit.
The application is realized by the following technical measures: a vibration damper of a nuclear power plant bar power unit comprises a counterweight mass block, a sliding guide rail, a bottom plate, a spring module and a locking/fine tuning module; the bottom plate and the sliding guide rail are arranged in parallel up and down, the middle is hollow, the first end of the bottom plate is connected with the front end of the sliding guide rail through the hinge module, and the second end of the bottom plate is connected with the rear end of the sliding guide rail through the spring module; the counterweight mass block is arranged above the sliding guide rail, is connected with the sliding guide rail in a sliding manner and slides back and forth along the sliding guide rail; the locking/fine tuning module is positioned between the counterweight mass and the sliding guide rail and is used for adjusting or fixing the position of the counterweight mass relative to the sliding guide rail.
Preferably, the spring module is composed of a tension spring and a compression spring, the upper end and the lower end of the tension spring are respectively and fixedly connected with the outer end faces of the sliding guide rail and the bottom plate, and the compression spring is positioned between the sliding guide rail and the bottom plate.
Preferably, the spring module comprises 2 groups of tension springs and 3 groups of compression springs.
Preferably, the locking/fine tuning module comprises a right angle member, wherein the vertical surface of the right angle member is adjustably connected with the outer end surface of the counterweight mass block through three bolts, and the horizontal surface of the right angle member is connected with the sliding guide rail through one bolt.
Preferably, the hinge module comprises an upper hinge piece, a lower hinge piece and a tapered roller bearing positioned between the lower hinge piece and the upper hinge piece, wherein the upper hinge piece is fixedly connected with the sliding track, and the lower hinge piece is fixedly connected with the bottom plate.
Preferably, the bottom plate is provided with a plurality of positioning holes.
The application has the beneficial effects that: 1) After the vibration damper is put into operation, the vibration of the rod power supply unit is effectively reduced, the vibration of the rod power supply unit is reduced to an ideal level, a floor foundation is protected, and the operation reliability of equipment is improved; 2) The vibration damping device has no quality or installation defect problem in one cycle period after formal operation, and the vibration damping effect is always kept in a standard range; 3) The vibration damper has reasonable structural design, minimized volume and weight, convenient transportation, disassembly, movement and quick installation, and the use and installation position does not influence the normal operation of the bar power unit and peripheral equipment thereof, does not damage the existing bedplate foundation and civil wall structure, and does not prevent the passing of power plant personnel and the operation, maintenance and overhaul.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:
FIG. 1 is a bar power system including units 1, 2;
FIG. 2 is a side view of the vibration damping device of the present embodiment;
FIG. 3 is a front view of FIG. 2;
FIG. 4 is a schematic view of the vibration damping device in place on FIG. 1;
FIG. 5 is a schematic view of a hinge module structure;
fig. 6 is a schematic diagram of the operation of the vibration damper.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. In this embodiment, the directions of the observer right in front of the vibration damping device are schematically illustrated in the vertical direction, the right hand side is the front, and the left hand side is the rear.
A nuclear power plant rod power unit vibration damper apparatus 200, as shown in fig. 2 and 3, includes a counterweight block 230, a sliding rail 240, a base plate 260, a spring module 210, and a lock/fine adjustment module 220. The base plate 260 is provided with a plurality of positioning holes for fixing the vibration damping device 200 to a motor base table (i.e., the base platform 300), as shown in fig. 4.
The bottom plate 260 is arranged in parallel with the sliding guide rail up and down, the middle is hollow, a first end of the bottom plate 260 is connected with the front end of the sliding guide rail through the hinge module 250, and a second end of the bottom plate 260 is connected with the rear end of the sliding guide rail through the spring module 210. The counterweight block 230 is disposed above the sliding rail, and is slidably connected to the sliding rail, and slides back and forth along the sliding rail.
The spring module 210 is composed of a tension spring 211 and a compression spring 212, wherein the upper end and the lower end of the tension spring 211 are respectively and fixedly connected with the outer end surfaces of the sliding guide rail and the bottom plate 260, and the compression spring 212 is positioned between the sliding guide rail and the bottom plate 260.
The locking/fine tuning module 220 is located between the counterweight block 230 and the sliding rail for adjusting or fixing the position of the counterweight block relative to the sliding rail. The locking/fine tuning module 220 comprises a right angle member, wherein the vertical surface of the right angle member is adjustably connected with the outer end surface of the counterweight mass block through three bolts, the bolts in the middle play a role in thrust and are fixedly connected with the counterweight mass block, the left and right two are jackscrews, and the upper counterweight mass block can be slightly moved back and forth by rotating the 2 jackscrews, so that the vibration frequency of the vibration damper can be accurately changed. The horizontal plane of the right-angle member is connected with the sliding guide rail through a bolt, and the right-angle member is fixed through the bolt after frequency modulation is finished, so that the counterweight block is prevented from being affected by vibration in the operation process to move so as to change the frequency.
As shown in fig. 5, the hinge module includes an upper hinge member, a lower hinge member, and a tapered roller bearing between the lower hinge member and the upper hinge member, the upper hinge member is fixedly connected with the sliding rail, and the lower hinge member is fixedly connected with the bottom plate. The hinge module is used for realizing the hinge between the bottom plate and the upper mass block.
The rod power supply unit vibration damper adopts a passive tuned mass damper scheme, wherein the Tuned Mass Damper (TMD) is the most commonly used passive control device in vibration control, an inertial mass block is usually arranged at a certain position of a structure, and the dynamic response of certain vibration modes (usually the first vibration mode) of a main structure is controlled by utilizing a resonance principle. The application adopts the TMD vibration absorber function to transfer the vibration of the foundation of the bar power unit to the vibration absorber, thereby reducing the vibration of the equipment during operation. The bottom plate and the sliding guide rail which are positioned at the lowest of the vibration damper are connected through the hinge module, the bottom plate and the sliding guide rail are connected up and down in a hinged mode to serve as fulcrums, and the pressure springs play a supporting role at the same time. The working principle is shown in fig. 6, wherein a mass m can slide on a rigid rod, and the distance relation between x and l is changed, so that the vibration frequency of the device is adjusted to be consistent with the frequency of a field device.
The frequency adjusting modes of the vibration damper comprise three modes, 1) adjusting parameters of the tension spring; 2) Increasing or decreasing the mass of the counter weight mass block; 3) Accurate fine tuning is achieved by moving the counterweight mass. The (1) and (2) modes are coarse tuning modes, the vibration frequency of the vibration damper can only be set to be close to the target frequency, the (3) mode is fine tuning mode, the counterweight mass block can be moved in combination with the test data of the instrument, and the vibration frequency of the vibration damper can be accurately adjusted to the target frequency.
The mounting and using steps of the vibration damper comprise:
Step one: transporting the device to a proper site for a test site to be positioned;
Step two: installing a vibration damper in a state that the rod power supply unit is stopped, measuring a table top at the installation position, dividing the specific setting position and the fixing hole position of the vibration damper, simultaneously carrying out leveling cleaning work on the table top at the installation position, punching holes at the marked position, and implanting an adhesive anchor bolt;
Step three: after the vibration damper is unpacked, the vibration damper is hoisted to a designated position by using hoisting equipment and is connected with an adhesive anchor bolt through a fastener, so that the vibration damper is fixedly connected with the table top of the motor base;
Step four: after the vibration reduction device is installed and fixed, starting a 1# rod power supply unit and a 2# rod power supply unit, and debugging and verifying the vibration and basic vibration conditions of the rod power supply unit in various states including single machine working conditions, double machine working conditions, low load, full load, instant starting, normal running and the like;
step five: if the vibration frequency of the vibration damper is inconsistent with the equipment and the basic vibration, the frequency is roughly adjusted by adjusting the spring parameters and increasing and decreasing the mass of the accessory mass block, then the accurate fine adjustment frequency is finely adjusted by moving the mass block, and finally the vibration frequency of the vibration damper is accurately adjusted to the target frequency;
Step six: when the vibration damper works, the energy absorption characteristic of the vibration damper utilizes the resonance principle to control the vibration response of the bar power unit equipment and the foundation thereof, and the vibration response is reduced to be within the standard range.
The vibration damper is put into practical production, and is measured and verified under various working conditions such as single-machine operation, double-machine operation, low-load operation, full-load operation and the like, the running condition of the vibration damper is stable and good, the basic vibration of the rod power unit is obviously reduced, the vibration values of the generator and motor equipment meet the standard requirements, the serious defect that the equipment vibration exceeds standard in the starting and running processes of the rod power unit in the past is effectively solved, and the running safety and reliability of the system and the equipment are improved. The vibration damper is configured and tested according to the following standard, the mass m of the counterweight block is 2500kg, the corresponding l of the vibration damper is 1670mm, the initial position x of the counterweight block is 1000mm, and the parameters of the pressure spring are as follows: the wire diameter is 40mm, the pitch diameter is 130mm, the free height is 140mm, the effective number of turns is 1.5, and the number of the turns is 3. The spring compression rate was 7671N/mm, and the number of the arrangement was 2.
1) After the vibration damper is installed on site, in the vibration test without load, the vibration speed of the two measuring points is 0.64 mm/s and 0.49mm/s under the working condition of stable operation of the single machine, and the vibration speed of the two measuring points is 0.64 mm/s and 0.52mm/s under the working condition of stable operation of the double machine. The attenuation rate is 73.1% -77.9% under the working condition of single machine stable operation compared with the working condition without the vibration damper, and is 83.0% -86.4% under the working condition of double machine stable operation compared with the working condition without the vibration damper;
2) The bar power supply unit is started for grid connection, and in vibration test after normal working state (on-load), the vibration speed of the two measuring points is 0.62 mm/s and 0.65mm/s; the vibration of the unit bar power unit is less than or equal to 2.8mm/s, and the requirements are met, as shown in the following table 1;
Table 1 vibration of the Power Unit of the load operation rod (after the vibration damper is installed)
3) The vibration damper has excellent vibration damping capacity, can effectively reduce vibration of the rod power unit and the floor slab, and realizes one-time successful starting of the rod power unit. Meanwhile, the installation of the vibration damper does not influence the normal operation of the bar power unit and peripheral equipment thereof, does not damage the existing bedplate foundation and civil engineering wall structure, and does not prevent the passing of power plant personnel and the operation, maintenance and overhaul.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. The vibration damper for the nuclear power plant rod power unit is characterized by comprising a counterweight mass block, a sliding guide rail, a bottom plate, a spring module, a hinge module and a locking/fine tuning module;
The bottom plate and the sliding guide rail are arranged in parallel up and down, the middle is hollow, the first end of the bottom plate is connected with the front end of the sliding guide rail through the hinge module, and the second end of the bottom plate is connected with the rear end of the sliding guide rail through the spring module;
the counterweight mass block is arranged above the sliding guide rail, is connected with the sliding guide rail in a sliding manner and slides back and forth along the sliding guide rail;
The locking/fine tuning module is positioned between the counterweight mass and the sliding guide rail and is used for adjusting or fixing the position of the counterweight mass relative to the sliding guide rail.
2. The vibration damper for the rod power unit of the nuclear power plant according to claim 1, wherein the spring module is composed of a tension spring and a compression spring, the upper end and the lower end of the tension spring are fixedly connected with the outer end surfaces of the sliding guide rail and the bottom plate respectively, and the compression spring is located between the sliding guide rail and the bottom plate.
3. The nuclear power plant rod power unit vibration damper according to claim 2, wherein the spring module comprises 2 sets of tension springs and 3 sets of compression springs.
4. The vibration damper of a nuclear power plant rod power unit according to claim 1, wherein the locking/fine tuning module comprises a right angle member, a vertical surface of the right angle member is adjustably connected with an outer end surface of the counterweight block through three bolts, and a horizontal surface of the right angle member is connected with the sliding guide rail through one bolt.
5. The vibration damper of a nuclear power plant rod power unit according to claim 1, wherein the hinge module comprises an upper hinge member, a lower hinge member and a tapered roller bearing positioned between the lower hinge member and the upper hinge member, the upper hinge member is fixedly connected with the sliding track, and the lower hinge member is fixedly connected with the bottom plate.
6. The vibration damper for a nuclear power plant rod power unit according to claim 1, wherein the base plate is provided with a plurality of positioning holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322427361.1U CN221257518U (en) | 2023-09-07 | 2023-09-07 | Vibration damper for rod power supply unit of nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322427361.1U CN221257518U (en) | 2023-09-07 | 2023-09-07 | Vibration damper for rod power supply unit of nuclear power plant |
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| CN221257518U true CN221257518U (en) | 2024-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322427361.1U Active CN221257518U (en) | 2023-09-07 | 2023-09-07 | Vibration damper for rod power supply unit of nuclear power plant |
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| CN (1) | CN221257518U (en) |
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- 2023-09-07 CN CN202322427361.1U patent/CN221257518U/en active Active
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