Damping check valve for nuclear power station ventilation system

Abstract

The invention discloses a damping check valve for a nuclear power station ventilation system. The damping check valve comprises a valve body assembly, a bearing assembly, a transmission shaft and a heavy hammer assembly, the transmission shaft penetrates through the valve body assembly and is connected with the valve body assembly through the bearing assembly, the heavy hammer assembly is arranged on the transmission shaft, and the heavy hammer assembly is arranged at one end of a damper, the other end of the damper is arranged on a damper connecting plate which is fixedly arranged on the valve body assembly. According to the damping check valve, the structural design is novel, the damper is additionally arranged between the valve body assembly and the heavy hammer assembly, the closing process of the valve is slow and stable, the stability of torque borne by the transmission shaft is maintained, the valve plate assembly is in a slightly-open state, the valve plate assembly is in a slightly-open state, and a valve plate assembly is in a slightly-open state; and the air pressure in a pipeline is stabilized, the vibration phenomenon of the heavy hammer assembly and the valve plate assembly is effectively relieved, and the accidents that the transmission shaft is broken and the valve plate assembly is torn are avoided.

Description

technical field [0001] The invention relates to the technical field of check valves, in particular to a vibration-damping check valve for a nuclear power plant ventilation system. Background technique [0002] Defects of existing check valves in nuclear power plants: 1. The opening angle is unstable, which causes the wind pressure in the pipeline to not be stable at the required value; 2. The required value of the wind pressure in the pipeline is high, and the opening pressure difference of the check valve is large. If it is large, it is easy to cause accidents such as fracture of the drive shaft and tearing of the valve plate assembly. [0003] When the wind pressure in the pipeline increases and reaches the opening pressure difference, the valve plate assembly opens, and the pressure in the pipeline drops sharply after the valve plate assembly is opened, and the valve plate assembly is quickly closed due to the gravity of the weight assembly. Repeating this process will l...

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Problems solved by technology

[0002] Defects of existing check valves in nuclear power plants: 1. The opening angle is unstable, which causes the wind pressure in the pipeline to not be stable at the required value; 2. The required value of the wind pressure in the pipeline is high, and the opening pressure difference of the check valve is large. Large, it is easy to cause accidents of drive shaft breakage and valve plate assembly tearing

Repeating this process will cause the wind pressure in the pipeline to change continuously, and will also cause the hammer assembly and valve plate assembly to be in a state of vibration all the time, making the drive shaft and valve plate assembly easily reach the fatigue limit

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