Gate valve of nuclear fuel transfer device

Abstract

The invention discloses a gate valve of a nuclear fuel transfer device. The gate valve of the nuclear fuel transfer device comprises a gate valve component and an operating rod component in detachable connection, the gate valve component comprises a valve plate, a valve rod and a valve housing of an oval cavity structure, the valve plate is of a wedge-shaped structure, a wedge-shaped groove matched with the valve plate is formed in the inner wall of the valve housing, the valve plate is slidably embedded in the wedge-shaped groove and connected onto the valve rod in a threaded manner, the valve rod is accommodated in the valve housing, and the upper end of the valve rod extends out of the valve housing and is detachably connected with the operating rod component. The valve rod is driven to rotate through the operating rod component, so that the valve plate ascends or descends along the valve rod so as to open or close a transfer passage; the valve plate and the valve housing are in wedge-type soft seal, a sealing effect is good, the problem of poor seal or water leakage is solved, and lubrication is not required; the wall thickness of the valve housing of the oval cavity structure is unequal, strength and rigidity of the valve housing are guaranteed, weight of the gate valve component is reduced, and decontamination is facilitated; the operating rod component is small in friction and operating torque of remote control, and the gate valve is simple in structure.

Description

technical field [0001] The invention relates to a gate valve of a nuclear fuel transfer device, in particular to a gate valve of a nuclear fuel transfer device capable of realizing remote operation. Background technique [0002] At present, pressurized water reactor is the mainstream reactor type of nuclear power plants. About 60% of the world's reactors are pressurized water reactors. Pressurized water reactor nuclear power plants are generally divided into two circuits: the primary circuit system and the secondary circuit system. The primary circuit system is called nuclear The island section, the secondary circuit system is a conventional island section with a steam turbine section and a generator section. The primary circuit system of the PWR nuclear power plant is completely separated from the secondary circuit system, and it is a closed circulation system. The principle flow of the nuclear power plant is: the main pump sends high-pressure coolant into the reactor, the...

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Problems solved by technology

[0004] However, in the fuel transfer compartment of the fuel plant, the radiation dose at the gate valve of the fuel transfer device is relatively high. In order to reduce the radiation damage to the human body, the spent fuel assembly needs to have sufficient water shielding during the transfer process. When the reactor pool After the fuel transfer tank is filled with water, the valve is opened by the remote joystick. The remote joystick used in nuclear power plants has a large operating torque, and it takes a certain amount of time to open the valve. Moreover, the structure design of the existing gate valve allows a small amount of leakage, and its shape is not easy. Decontamination

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