Hydraulic nut for reactor pressure vessel

A technology for hydraulic nuts and pressure vessels, which is applied in the direction of nuts, fluid pressure actuation devices, fluid pressure actuation system components, etc., can solve the problems of high time cost, high manufacturing and operation and maintenance costs, and achieve reliability and simplification. The effect of tightening and dismantling the process and shortening the time occupied by the critical path

Pending Publication Date: 2018-03-06
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manufacturing and operation and maintenance costs of this special tool are extremely high, and the time for opening or closing the reactor pressure vessel top cover during each outage for refueling is relatively long, and the time cost for reactor pressure vessel outage for refueling is extremely high

Method used

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  • Hydraulic nut for reactor pressure vessel
  • Hydraulic nut for reactor pressure vessel
  • Hydraulic nut for reactor pressure vessel

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Embodiment Construction

[0016] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Such as Figure 1-3 As shown, the embodiment of the present invention provides a hydraulic nut which is satisfied with providing pre-tightening for the main bolt of the reactor pressure vessel and realizing the connection and sealing between the top cover of the reactor pressure vessel and the cylinder body. The hydraulic nut has a hydraulic nut series cylinder structure, so The hydraulic nut series cylinder structure includes 1. Spherical washer; 2. Primary oil cylinder; 3. Primary and secondary piston; 4. Secondary oil cylinder; .Stretching nut; 9. Hexagon socket head screw; 10. Compression block; 11. Compression ring one; 12. Compression ring two; 13. Oil block; 14. Hexagon socket plug; 15. Cone Threaded short tube; 16....

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Abstract

The invention provides a hydraulic nut for a reactor pressure vessel, which has a hydraulic nut serial cylinder structure, and the hydraulic nut serial cylinder structure includes a first-level oil cylinder; a first-level and second-level piston; a second-level oil cylinder; a third-level oil cylinder; and a third-level piston; Compression block; compression ring 1; compression ring 2; oil block; inner hexagonal plug; conical threaded short pipe; screw sleeve; collar; compression ring 3; compression ring 4; C-shaped sealing ring; Parallel pins; socket head cap screws; female couplings; couplings; and male couplings. The hydraulic nut for the reactor pressure vessel provided by the present invention is designed more than the traditional bolt tensioning machine, replaces the common nut in the main bolt assembly of the reactor pressure vessel, and has the pre-tightening function of the main bolt assembly.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor design in a pressurized water reactor nuclear power plant, in particular to a hydraulic nut for a reactor pressure vessel. Background technique [0002] Hydraulic nuts are widely used in many industrial fields. However, due to the particularity of the working conditions of the reactor pressure vessel, there is no precedent for hydraulic nuts to be used on the main bolts of the reactor pressure vessel. Pressurized water reactor nuclear power units are shut down for refueling every 18 months, and the reactor pressure vessel needs to be opened and closed every time the fuel is shut down. The reactor pressure vessel is a high-temperature and high-pressure pressure medium inside, and the sealing form of the top cover flange and the cylinder flange is O-shaped metal ring + bolt connection. The size and uniformity of the pre-tightening force of the main bolts directly affect the safety of the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B37/00F15B21/00
CPCF16B37/00F15B21/00
Inventor 景益周文林绍萱唐伟华刘润发陈宇帆王恺赵战国魏猛陈红生史志龙吕莹
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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