Shock absorption foundation of control rod driving mechanism fan
A driving mechanism and control rod technology, applied in the direction of machines/engines, liquid fuel engines, mechanical equipment, etc., can solve the problems of poor vibration isolator performance, weak shock absorption capacity, etc., and achieve strong shock absorption performance, long service life, The effect of ensuring safe and stable operation
Pending Publication Date: 2021-01-15
CNNC NUCLEAR POWER OPERATION MANAGEMENT +1
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Problems solved by technology
[0003] The purpose of the present invention is to provide a damping foundation for a fan with a control rod drive mechanism in order to solve various fan vibration problems caused by the weak damping capability of the damping foundation of the fan with a control rod drive mechanism and poor performance of the vibration isolator. Efficiently, stably and safely reduce the operating vibration value of the ventilation fan of the control rod drive mechanism, and improve the operation stability of the fan
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[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0024] In order to find out the root cause of the fan vibration of the control rod drive mechanism, through the vibration measurement and analysis of the high vibration reporting point of the problem fan, it is found that the fan vibration is dominated by the power frequency vibration of 49.66 Hz, and there are relatively abundant harmonic components. The vibration is dominated by the unbalanced exciting force. Because the foundation is flexible, the insufficient rigidity makes the vibration amplitude larger. At the same time, the RRM fan uses a backward and fragile rubber shock absorber as the shock absorption method, which has poor shock absorption effect and short service life, and is not suitable for the control rod drive mechanism fan that has been isolated for 18 months.
[0025] On this basis, this embodiment provides a shock-a...
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The invention belongs to the technical field of nuclear power unit equipment, and particularly relates to a shock absorption foundation of a control rod driving mechanism fan. The shock absorption foundation comprises a rigid foundation frame, a steel wire rope shock absorbers and dampers, wherein the fan is installed on the rigid foundation frame, and the steel wire rope shock absorbers are installed at the bottom of the rigid foundation frame and used for supporting the rigid foundation frame and achieving the shock absorbing effect; and metal damping materials in the dampers are used for consuming motion energy, so that the purposes of shock absorption and energy dissipation are achieved. The shock absorption foundation has the characteristics of being long in service life, free of maintenance during use, safe, reliable and the like; Flexible vibration and resonance are reduced through the rigid foundation frame with high rigidity, the steel wire rope shock absorbers with good shockabsorption effect and long service life are used for replacing original rubber shock absorbers to reduce fan vibration and prolong the service life of equipment, and the dampers are innovatively usedfor absorbing fan kinetic energy, so that the fan vibration is reduced, and the problem of vibration of various fans caused by weak fan foundation and poor vibration isolator performance is solved.
Description
technical field [0001] The invention belongs to the technical field of nuclear power unit equipment, and in particular relates to a damping foundation for a fan of a control rod drive mechanism. Background technique [0002] The cooling and ventilation system of the control rod drive mechanism of the nuclear power plant (RRM system for short) is an important ventilation and cooling system inside the nuclear island. If the unit is running at full power, the RRM fan fails to operate normally, the control rod cooling mechanism will not be able to be effectively cooled, and the unit must enter the cold shutdown mode. The model of the RRM fan is a C-type centrifugal fan, the motor is directly connected to the impeller, and the basic frame is made of channel steel welded and formed, and the rubber shock absorber is used as the main shock-absorbing means. RRM series fans have frequently experienced high vibration problems since they were put into operation. The vibration value of ...
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IPC IPC(8): F04D29/66
CPCF04D29/668
Inventor 施雪峰翁云峰宋华周伟费志松王成林
Owner CNNC NUCLEAR POWER OPERATION MANAGEMENT
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