Anti-loose fastener for connection of nuclear power equipment

Abstract

The invention provides an anti-loose fastener for connection of nuclear power equipment. The fastener comprises a stud and a nut connected with the end portion of the stud, wherein one end of the stud is screwed into a threaded hole in the bottom of a to-be-connected part in a threaded mode, the other end of the stud is provided with a protruding portion which penetrates through a through hole in one to-be-connected part or through holes in several to-be-connected parts and then is screwed with the nut, the protruding portion is arranged outside the nut, and a plurality of semi-circle grooves are formed in the protruding portion. An anti-loose cup wraps the other end of the stud and the whole nut, a contact portion of the anti-loose cup and the protruding portion of the stud is a wrapping ring, and the wrapping ring and the semi-circle grooves in the protruding portion are clamped through clamping tools. The anti-loose cup and the nut are fixedly connected through a plurality of pins, and at the time, the nut, the stud and the anti-loose cup are connected into a whole and can not relatively rotate. The anti-loose fastener is simple and reliable in structure, capable of solving anti-loose problems of a fastening stud in a nuclear power project, and capable of guaranteeing that the stud cannot loose for a long time.

Description

technical field [0001] The invention relates to a nuclear power equipment connection device, in particular to an anti-loosening fastener for nuclear power equipment connection. Background technique [0002] In nuclear reactors, in order to achieve the positioning and fixing of equipment, it is necessary to use a large number of fasteners. The flow-induced vibration of nuclear reactors can easily cause loosening of fasteners. In order to reduce the risk of accidents caused by fastener failure, new nuclear reactors have been designed to minimize the use of fasteners, but the necessary fasteners are still It cannot be canceled, which requires improving the anti-loosening performance of fasteners as a guarantee of safety. [0003] Fastening studs are commonly used fasteners for reactors, and generally consist of studs and nuts. Such as figure 1 As shown, in the long-term vibration working environment, the simple tightening of studs and nuts is prone to fastening failure. Gen...

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Problems solved by technology

[0004] In the reactor, in order to prevent the failure of the fastening, the general anti-loosening structure (such as figure 1 shown) is spot welding on the nut and the connected parts, but the vibration of the equipment will cause the overall horizontal slippage of the stud and the nut, and the anti-loose welding spot on the nut may be damaged due to large shear load or fatigue. Failure, after the anti-loosening solder joint fails, it will cause the nut or the nut and the stud to fall off as a whole

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