A hollow-structured non-metallic Dewar for AC superconducting magnets

Abstract

The invention discloses a hollow-structure nonmetal Dewar type barrel for an alternating-current superconducting magnet, which comprises an inner-outer barrel (1), a middle barrel (2), a Dewar type cover plate (3), a vacuum interlayer (4) and a vacuum suction nozzle (5), wherein the nonmetal Dewar type barrel adopts a hollow structure with indoor temperature holes; and the Dewar type barrel comprises the inner-outer barrel (1) and the middle barrel (2) which are made of epoxy resin and glass fibre in an integrated and curing forming manner, wherein the vacuum interlayer (4) is arranged between the inner-outer barrel (1) and the middle barrel (2) and is subjected to vacuumizing by the vacuum suction nozzle (5), and a molecular sieve is adopted as an adsorbent for keeping the high vacuum degree. A plurality of layers of thermal insulation materials are pasted on the side walls and the bottom of the barrel of the vacuum interlayer (4), so that conduction heat and radiant heat are reduced; and in the plurality of layers of thermal insulation materials, a reflecting screen is cut off along the peripheral direction, so that the vortex is reduced. The Dewar type cover plates are positioned above the inner-outer barrel (1) and the middle barrel (2), and the magnet and a low-temperature medium are contained in the middle barrel (2).

Description

technical field [0001] The invention relates to a non-metallic low heat leakage Dewar vessel applied to an AC superconducting magnet. Background technique [0002] In cryogenic and superconducting technologies, most of the cryogenic Dewar vessels used in the market are made of stainless steel metal materials. The main defect of the metal Dewar vessel is that when it is used in AC superconducting magnet systems such as superconducting transformers, superconducting reactors, and AC strong field devices, eddy current losses will occur in the stainless steel shell. For AC magnets, it is not only required that the Dewar container containing superconducting magnets and low-temperature medium should have a low heat leakage rate, but also requires that it does not generate eddy current loss, so as to ensure that the superconducting magnet has a high working performance. Efficiency and long-term stable operation. In addition, many AC magnet systems need to adopt a hollow structure ...

AI Technical Summary

Problems solved by technology

The advantage of FRP Dewar is that there is no AC loss, and the disadvantage is that the bonding performance is poor, and the joints are prone to cracking after repeated cold and heat shocks, resulting in liquid nitrogen leakage

And there is a problem of permanent outgassing and it is difficult to maintain a high vacuum degree in the interlayer for a long time, so the workload of repeatedly maintaining the vacuum degree of the vacuum interlayer during operation is relatively large

Chinese patent 201210122287.6 proposes a non-metallic non-magnetic liquid nitrogen Dewar made of epoxy glass fiber reinforced plastic, which consists of a vacuum cover and a Dewar liner. The vacuum cover of the non-metallic liquid nitrogen Dewar is a square structure, and the Dewar liner It is a cylindrical structure, and does not adopt a hollow structure with room temperature holes, and its Dewar liner and vacuum cover do not involve the integrated molding process

Chinese patent 03152770 also proposes a non-metal composite low-leakage heat-leakage Dewar vessel made of a glass liner and a FRP shell. The Dewar vessel also adopts a hollow structure with room temperature holes, but the integrated blowing process of the glass liner is relatively Complicated, there are also difficulties in the assembly of the glass liner and the FRP shell

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