CN210599585U - Shock absorption foundation of control rod driving mechanism fan - Google Patents
Shock absorption foundation of control rod driving mechanism fan Download PDFInfo
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- CN210599585U CN210599585U CN201921101617.7U CN201921101617U CN210599585U CN 210599585 U CN210599585 U CN 210599585U CN 201921101617 U CN201921101617 U CN 201921101617U CN 210599585 U CN210599585 U CN 210599585U
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Abstract
The utility model belongs to the technical field of nuclear power unit equipment, concretely relates to shock attenuation basis of control rod drive mechanism fan, including rigidity foundation frame, wire rope bumper shock absorber and attenuator, the fan is installed on rigidity foundation frame, and the wire rope bumper shock absorber is installed in rigidity foundation frame bottom for support rigidity foundation frame and realize the cushioning effect, and utilize the metal damping material consumption kinetic energy in the attenuator, thereby reach the purpose of shock attenuation energy dissipation. The device has the characteristics of long service life, no need of maintenance during use, safety, reliability and the like; the flexible vibration and the resonance are reduced through the rigid base frame with high rigidity, the original rubber shock absorber is replaced by the steel wire rope shock absorber with good shock absorption effect and long service life to reduce the vibration of the fan and prolong the service life of equipment, and the damper is innovatively used for absorbing the kinetic energy of the fan, so that the vibration of the fan is reduced, and the problems of various fan vibrations caused by weak foundation of the fan and poor performance of the vibration isolator are solved.
Description
Technical Field
The utility model belongs to the technical field of nuclear power unit equipment, concretely relates to shock attenuation basis of control rod drive mechanism fan.
Background
A cooling and ventilating system (RRM system for short) of a control rod driving mechanism of a nuclear power plant belongs to an important ventilating and cooling system in a nuclear island and is used for ensuring the temperature of a power supply coil and a position indicator of the control rod driving mechanism to be within a normal range so as to ensure the control rod driving mechanism to normally run. If the RRM fan fails to normally operate during the full-power operation of the unit, the control rod cooling mechanism cannot be effectively cooled, and the unit must enter a cold stop mode. The RRM fan is a C-type centrifugal fan, a motor is directly connected with an impeller, a basic frame is manufactured in a channel steel welding forming mode, and a rubber damper is used as a main damping means. The RRM series fan frequently has vibration reporting problem at the beginning of operation, the vibration value of an individual fan is always kept near 6.0mm/s and exceeds the nuclear power standard value by 5.5mm/s, even infinitely approaches and exceeds the national standard value by 7.5mm/s, and the vibration condition is very bad. The vibration problem has become a common problem for RRM fans. The risk of unit operation and the equipment maintenance cost are seriously increased, and under the condition that a nuclear island is closed during the daily operation of the unit, maintenance personnel are caused to enter the nuclear island with power for rush repair for many times, so that greater personnel safety risk and unit operation risk exist. In order to reduce RRM fan vibration and improve equipment stability, a damping foundation of a control rod drive mechanism fan with higher rigidity needs to be redesigned.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a shock attenuation basis of control rod drive mechanism fan to the shock attenuation basis shock-absorbing capacity weak, the poor multiple fan vibration problem that leads to of isolator performance of current control rod drive mechanism fan to high-efficient, stable, safe reduction control rod drive mechanism ventilation fan's operational vibration value improves the operating stability of fan.
The technical scheme of the utility model as follows:
a damping foundation of a control rod drive mechanism fan comprises a rigid foundation frame and a steel wire rope damper, wherein the rigid foundation frame is of a steel frame structure, and the fan is installed on the rigid foundation frame; the steel wire rope shock absorber is arranged at the bottom of the rigid foundation frame and used for supporting the rigid foundation frame and achieving a shock absorption effect.
Furthermore, the bottom of the rigid base frame is also provided with one or more dampers, the bottom of each damper is arranged on the ground, the top of each damper is arranged at the bottom of the rigid base frame, and the installation height of each damper is such that the bottom of each damper just contacts the ground.
Furthermore, the damper is a composite dry friction type damper composed of a metal mesh pad and a spiral spring.
Further, the rigid base frame comprises an upper plane, a lower plane and a middle supporting plate which are made of the same material, the upper plane and the lower plane are in the same shape, the middle supporting plate is fixed between the upper plane and the lower plane, and the control rod driving mechanism fan is installed on the upper plane.
Further, the upper plane and the lower plane of the rigid foundation frame are cut into a shape like a Chinese character 'tian' from steel plates of the same specification, and the middle supporting plate comprises a steel plate perpendicular to the upper plane and the lower plane and is welded on the upper plane and the lower plane in a fillet welding mode.
Furthermore, one or more equipment installation platforms are welded on the upper plane, and the fan is installed on the equipment installation platforms; the equipment mounting platform is of a flat plate-shaped structure and is used for keeping the mounted fan horizontal and free of virtual angle deformation.
Further, the upper plane and the equipment mounting platform are provided with protruding extension platforms for placing a level ruler to horizontally calibrate the rigid base frame.
Furthermore, the number of the steel wire rope shock absorbers is more than two, the bottom of each steel wire rope shock absorber is fixedly connected with a bottom plate, and rubber is pasted at the bottom of each bottom plate.
Furthermore, the number of the steel wire rope shock absorbers is more than two, the bottom of each steel wire rope shock absorber is fixedly connected with a bottom plate, and rubber is pasted at the bottom of each bottom plate.
The beneficial effects of the utility model reside in that:
the damping base of the control rod driving mechanism fan can well solve the problems of vibration of various fans caused by weak fan base and poor vibration isolator performance, has the characteristics of strong damping performance, long service life, no need of maintenance during use, safety, reliability and the like, can efficiently, stably and safely reduce the operation vibration value of the control rod driving mechanism ventilation fan, and improves the operation stability of the fan; the shock attenuation basis can reduce the defect, effectively prolongs fan, motor life. Meanwhile, the utility model can greatly reduce the times and cost for the maintenance personnel to maintain the equipment, and reduce the irradiation dose of the maintenance personnel; the motor and the impeller of the fan are protected from being damaged by vibration; the condition that maintenance personnel rush repair RRM fans with power entering the island is reduced or even eliminated; the safe and stable operation of the nuclear island unit is guaranteed.
Drawings
Fig. 1 is a schematic view of a damping base structure of a control rod drive mechanism fan of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a front view of FIG. 1;
FIG. 4 is a left side view of FIG. 1;
FIG. 5 is a schematic view of the damper of FIG. 1;
FIG. 6 is a top view of FIG. 5;
in the figure: 1-a fan motor; 2-a motor bracket; 3, a fan; 4-mounting holes for steel wire rope dampers; 5-level ruler checking platform; 6-damper mounting holes; 7-expansion bolt holes of the damper; 8-a shock absorbing base frame; 9-wire rope shock absorbers; 10-a damper; 11-lifting lugs; 12-equipment mounting waist holes; 13-equipment mounting platform; 14-rectangular bottom plate of steel wire rope shock absorber; 15-rubber pad at the bottom of the shock absorber.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In order to find out the root cause of the vibration of the control rod driving mechanism fan, vibration measurement and analysis are carried out on the vibration high report point of the problem fan, and the fan vibration is mainly carried out at the power frequency of 49.66Hz and has abundant harmonic components. The vibration is mainly unbalanced exciting force, and the vibration amplitude is larger due to the fact that the foundation is a flexible foundation and the rigidity is insufficient. Meanwhile, the RRM fan adopts a backward and easily damaged rubber damper as a damping means, has poor damping effect and short service life, and is not suitable for a control rod driving mechanism fan which runs in an isolated mode for 18 months.
On the basis, the embodiment provides a damping foundation of a control rod drive mechanism fan, which has a structure shown in fig. 1 and consists of 3 parts, wherein the 3 parts are an integral part; a first part being a rigid base frame 8, a second part being a wire rope shock absorber 9, and a third part being a damper 10, as shown in fig. 1 to 4.
The rigid base frame 8 is formed by cutting and welding Q235B steel plates with the thickness of 1 CM: the upper surface and the lower surface are cut into a shape like a Chinese character 'tian' by a whole Q235B steel plate in a hollow way, the middle parts of the two planes are connected by welding through a rectangular steel plate which is vertically placed and has the height of 17CM and the same specification, the welding method mainly adopts fillet welding, and the welding and reinforcing positions of the steel plate are shown in figure 2. The length, width and height of the welded foundation frame are as follows: 1210mm × 990mm × 202 mm; the frame mass is 436 Kg; has extremely strong rigidity and stability.
The welding of basis front has three equipment fixing platform 13 to distribute on 3 vertical edges on the left side, the middle side, the right side of "field" font basal plane, and 1CM of outstanding basal plane of mounting platform has carried out the specialty and has made level, ensures that there is not the circumstances such as imaginary angle deformation after fan, the motor installation, leaves 8 on the mounting platform simultaneously and runs through waist hole 12: the waist holes are 30mm long and 10mm wide, 4 waist holes on the left side are used for mounting the motor bracket 2, four waist holes on the right side are used for mounting the fan 3, and the connection mode is bolt connection; as shown in the figure 2, the left side line and the upper side line of the Chinese character tian-shaped foundation respectively protrude leftwards and upwards to form an extension platform 5 with the length of 3800 and the width of 20mm, and the platform is used for placing a horizontal ruler so as to horizontally calibrate the fan foundation.
24 bolt holes 4 on the upper side and the lower side of the lower steel plate of the foundation frame are used for installing a steel wire rope vibration isolator 9, and 8 bolt holes 6 on the left side and the right side are used for installing a damper 10. The upper side and the lower side of the base frame are welded with 4 hoisting holes 11, the diameter of each hoisting hole is 70mm, and the hoisting holes are used for transporting the base frame, as shown in figure 4.
Wire rope bumper shock absorber 9 belongs to outsourcing spare, and 6 quantity in this embodiment are installed at foundation frame bottom bolt hole 4 through bolted connection, and the mounted position is seen in figure 1, figure 2 and figure 3, and there is rectangular bottom plate 14 shock absorber bottom through bolted connection, and rubber 15 is pasted to the bottom plate bottom, and the wire rope bumper shock absorber is directly placed subaerially at the factory building, need not to use expansion bolts to be connected with ground. Compared with the original rubber vibration isolator, the inhibition efficiency of the steel wire rope vibration isolator on the vibration response can be improved by 20-25%. Meanwhile, the steel wire rope shock absorber is long in service life, does not need special maintenance during use, and is suitable for the field of nuclear power.
In the embodiment, 4 dampers 10 are arranged, and the damper mounting holes 6 at the bottom of the rigid base frame 8 and the expansion bolt holes 7 of the dampers are connected through bolts, the mounting position is shown in fig. 4, and the structure diagram is shown in fig. 5 and 6. The structure is a composite dry friction type damper composed of a metal mesh pad and a spiral spring. The vibration damping system plays a role in driving the damper to move through vibration displacement generated by the motor 1 and the fan 3 in use, and the metal damping material in the damper is used for consuming motion energy, so that the purposes of shock absorption and energy dissipation are achieved, the conditions of loosening and displacement of parts of equipment under the high-frequency vibration condition and the like are prevented, the vibration value of the fan is further reduced, and the operation stability is improved. The damper does not play a supporting role in the system, and the weight of the fan is shared by 6 groups of shock absorbers. The damper installation method comprises the following steps: connect attenuator and basic frame bottom bolt hole 6 in advance, install at the factory building back at the shock attenuation basis, adjust the high rotatory attenuator of attenuator can height-adjusting to the attenuator bottom just contact ground, beat expansion bolts afterwards and make attenuator and factory building ground be connected fixedly.
The working principle of the damping device of the embodiment is as follows: the rigid foundation frame 8 with high rigidity reduces the flexible vibration and the resonance, and the steel wire rope shock absorber 9 with good shock absorption effect and long service life is used for replacing the original rubber shock absorber to reduce the vibration of the fan 3 and prolong the service time of the foundation. Meanwhile, a combined dry friction type damper composed of a metal mesh pad and a spiral spring is innovatively used for absorbing kinetic energy of the fan 3, so that vibration of the fan 3 is reduced. Adopt the utility model discloses a damping device just can effectively reduce control rod drive mechanism fan 3's operation vibration value, reduces vibration defect's production.
The damping device of the embodiment is specifically installed as follows:
firstly, dismantling a base frame and rubber dampers of a fan of an original control rod driving mechanism, transporting a high-performance damping foundation to a fan construction site by using lifting holes 11, confirming that 6 steel wire rope dampers 9 are connected to bolt holes 4 at the bottom of the base frame, confirming that 4 dampers 10 are connected to bolt holes 6 at the bottom of the base frame, and rotating the dampers 10 to enable the height of the dampers to be reduced to the minimum. Then put this patent shock attenuation basis flat to former fan basis position, pass through waist hole 12 on the basis with fastening bolt and connect fan 3 and motor support 2. The fan is installed on the new damping foundation, and then the level ruler is placed on the measuring platform 5 to confirm whether the foundation is level or not. And if the foundation level does not reach the standard, adding a thin steel plate below the bottom plate 14 of the steel wire rope shock absorber 9 to adjust the foundation level. After the horizontal adjustment is completed, the height of the damper 10 is adjusted by rotating the damper so that the bottom of the damper just contacts the ground. And then, expanding bolts are arranged in 4 bolt holes 7 at the bottom of the damper, so that the damper is fixedly connected with the plant ground. This patent control rod drive mechanism fan high performance shock attenuation basis installation is accomplished this moment.
The damping device of the embodiment has the following beneficial effects:
the control rod drive mechanism ventilation fan high performance shock attenuation basis that describes in this embodiment belongs to the rigidity basis, can reduce the flexible vibration of fan 3, and wire rope bumper shock absorber 9 has better shock attenuation effect than rubber shock absorber utensil, and the attenuator 10 can absorb the vibration energy that the fan 3 produced when moving to improve the operating stability of fan 3, reduce the vibration value. The device can well solve the problems of vibration of various fans caused by weak foundation and poor performance of the vibration isolator of the fans, reduce the frequency and cost of overhauling equipment by maintainers, and reduce the irradiation dose of the maintainers; the motor and the impeller of the fan are protected from being damaged by vibration; the condition that maintenance personnel rush repair the fan with power entering the island is reduced or even eliminated; the safe and stable operation of the nuclear island unit is guaranteed.
The technical scheme of the square-family mountain nuclear power generating unit is practiced during 103,203 major repair, the vibration condition of the RRM fan is greatly improved, and the vibration condition of the installed fan damping foundation is shown in table 1. The vibration values of the 8 modified fans can be intuitively observed to be kept about 2.0mm/s and far lower than the nuclear power vibration standard value by 5.5 mm/s. The four fans with serious vibration problems before transformation are well controlled in vibration, and the vibration value is kept stable after the four fans are operated for a period of time, so that abnormal fluctuation and defects are avoided.
TABLE 1 high Performance damping Foundation reconstructed rear Fan vibration Condition
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (10)
1. The utility model provides a shock attenuation basis of control rod drive mechanism fan which characterized in that: the wind power generation system comprises a rigid base frame (8) and a steel wire rope shock absorber (9), wherein the rigid base frame (8) is of a steel frame structure, and a fan (3) is installed on the rigid base frame (8); the steel wire rope shock absorber (9) is arranged at the bottom of the rigid foundation frame (8) and is used for supporting the rigid foundation frame (8) and achieving a shock absorption effect.
2. The vibration damping mount for a crdm fan as set forth in claim 1, wherein: the bottom of the rigid base frame (8) is also provided with one or more dampers (10), the bottom of each damper (10) is arranged on the ground, the top of each damper is arranged at the bottom of the rigid base frame (8), and the installation height of each damper (10) is such that the bottom of each damper just contacts the ground.
3. The vibration damping mount for a crdm fan as set forth in claim 2, wherein: the damper (10) is a composite dry friction type damper composed of a metal mesh pad and a spiral spring.
4. A vibration damping mount for a crdm fan as set forth in claim 1, 2 or 3, wherein: the rigid base frame (8) comprises an upper plane, a lower plane and a middle supporting plate which are made of the same material, the upper plane and the lower plane are in the same shape, the middle supporting plate is fixed between the upper plane and the lower plane, and the control rod driving mechanism fan (3) is installed on the upper plane.
5. The vibration damping mount for a crdm fan as set forth in claim 4, wherein: the upper plane and the lower plane of the rigid foundation frame (8) are cut into a shape like a Chinese character 'tian' from steel plates with the same specification, and the middle supporting plate comprises a steel plate which is perpendicular to the upper plane and the lower plane and is welded on the upper plane and the lower plane in a fillet welding mode.
6. The vibration damping mount for a crdm fan as set forth in claim 4, wherein: one or more equipment mounting platforms (13) are welded on the upper plane, and the fan (3) is mounted on the equipment mounting platforms (13); the equipment mounting platform (13) is of a flat plate-shaped structure and is used for keeping the mounted fan (3) horizontal and free of virtual angle deformation.
7. The vibration damping mount for a crdm fan as set forth in claim 6, wherein: the upper plane and the equipment mounting platform (13) are provided with a protruding extension platform (5) for placing a horizontal ruler to horizontally calibrate the rigid base frame (8).
8. A vibration damping mount for a crdm fan as set forth in claim 1, 2 or 3, wherein: the steel wire rope shock absorbers are characterized in that the number of the steel wire rope shock absorbers (9) is more than two, the bottom of each steel wire rope shock absorber (9) is fixedly connected with a bottom plate (14), and rubber sheets (15) are pasted on the bottoms of the bottom plates (14).
9. The vibration damping mount for a crdm fan as set forth in claim 7, wherein: the steel wire rope shock absorbers are characterized in that the number of the steel wire rope shock absorbers (9) is more than two, the bottom of each steel wire rope shock absorber (9) is fixedly connected with a bottom plate (14), and rubber sheets (15) are pasted on the bottoms of the bottom plates (14).
10. A vibration damping mount for a crdm fan as set forth in claim 1, 2 or 3, wherein: and hoisting holes (11) are formed in two sides of the rigid foundation frame (8) and used for installing lifting lugs to realize transportation of the damping foundation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921101617.7U CN210599585U (en) | 2019-07-15 | 2019-07-15 | Shock absorption foundation of control rod driving mechanism fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921101617.7U CN210599585U (en) | 2019-07-15 | 2019-07-15 | Shock absorption foundation of control rod driving mechanism fan |
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| CN210599585U true CN210599585U (en) | 2020-05-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228406A (en) * | 2019-07-15 | 2021-01-15 | 中核核电运行管理有限公司 | Shock absorption foundation of control rod driving mechanism fan |
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2019
- 2019-07-15 CN CN201921101617.7U patent/CN210599585U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228406A (en) * | 2019-07-15 | 2021-01-15 | 中核核电运行管理有限公司 | Shock absorption foundation of control rod driving mechanism fan |
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