Hay Think learned from the Institute of Plasma, Hefei Research Institute, Chinese Academy of Sciences, that the Dewar super-large rectangular bellows contract task undertaken by the ITER program of the International Thermonuclear Fusion Experimental Reactor has made important progress, and it has successfully developed the largest size in the world. The multi-layer rectangular bellows with the highest degree of difficulty has passed the final design review of the ITER International Organization Expert Group and entered the mass production stage.
The ITER Dewar rectangular corrugated pipe is an important part connecting the vacuum chamber window, Dewar and biological shielding layer. Its main function is to ensure the vacuum tightness of the window position of the Tokamak device, and also to compensate for the window under various working conditions. The relative displacement of the position is one of the important safety components of the ITER device. Due to the large size of the rectangular bellows, the number of layers, the high tolerance requirements, and the need to be formed at one time, these harsh requirements have brought great challenges to the technology, and there is no reference to the research and development precedent in the world.
Under the leadership of the ITER Center of the Ministry of Science and Technology of China, the R&D team formed by the Institute of Plasma and Nanjing Chenguang Dongluo Bellows Co., Ltd. won the international bidding with Germany, Switzerland and other European countries, and won the Dewar rectangular bellows. Development and mass production contract, a total of 91 rectangular corrugated pipes. This is another cash contract that my country has obtained through international competition in the ITER project.
In the past two years, the project team has relied on independent innovation to overcome a series of key technical problems such as the design and process of the integrated forming machine for large rectangular bellows, the synchronous precision control technology of multiple cylinders, and the dynamic simulation and monitoring technology of the forming of large multi-layer rectangular bellows. Successfully developed the ITER Dewar rectangular bellows, and the developed samples showed excellent performance in the pressure test. The change rate of the wave pitch at a pressure of 0.2 MPa was less than 6%, which was far less than the 15% required by ITER. The overall deformation of the rear bellows is less than 2 mm.
The successful development of the ITER Dewar super-large rectangular bellows indicates that China’s large-scale non-standard bellows design and development technology has entered the world’s forefront, demonstrating China’s innovation and creativity, and the design and construction of future fusion reactors and large-scale nuclear power equipment require large and complex cross sections The design, development and process exploration of multi-layer bellows have laid a solid foundation.