Structure and method for cold shied rapid temperature reduction

Abstract

The invention discloses a structure for cold shied rapid temperature reduction. The structure comprises a refrigerating machine, an inlet valve, a room temperature dewar, a liquid injection passage, acold shied, a heat pipe, a liquid helium container, an air outlet passage, an outlet valve, a condensed heat exchanger, an external liquid injection pipe, and the refrigerating mechanism longitudinally penetrates through the dewar and arranged above the middle of the room temperature dewar. According to the structure, low-temperature liquid is introduced to the heat pipe from the exterior, heat coupled with a cold shied outer tube and a cold shield end plate can be rapidly absorbed, and the rapid temperature reduction of the cold shield can be achieved. A manner of 'gas-liquid circulation' formed by using low-temperature liquid can effectively maintain the low temperature of the cold shield, and additional low-temperature liquid replenishment is not needed. Compared with a current technology in which the cold shield is cooled down by using the conduction of a copper weaving belt, the structure and a method have the advantages of compact structure and low temperature difference of a cooling object, and the structure is firm and durable, has good social benefits and is suitable for popularization and use.

Description

technical field [0001] The invention relates to a structure for rapid cooling, in particular to a structure and method for rapid cooling of cold screens, and belongs to the technical field of structural applications for rapid cooling of cold screens. Background technique [0002] A cryostat is a commonly used measurement or storage device in scientific research and industrial production. In some cases, the stability of its internal low temperature environment is required to be high. For example, a cryostat used for a superconducting magnet must maintain its internal temperature. Low temperature environment, it is necessary to effectively reduce the external radiation heat transfer to its low temperature environment. [0003] Installing cold screens is one way to significantly reduce radiative heat transfer. Therefore, the cold shield is an important part of the low-temperature superconducting magnet, and it is also one of the key technologies to realize the "zero volatiliza...

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Problems solved by technology

[0005] 1. When the distance between the first-level cold head and the cold screen is relatively long, and a certain amount of cooling needs to be guaranteed, the copper braid used for cooling needs to be thicker and longer, which will not only result in narrow assembly space and magnet volume The increase will also make the copper flange connected to the first-level cold head bear the weight of the copper braid, making it difficult to ensure the matching size between the copper flange and the cold head, reducing the cooling efficiency;

[0006] 2. The cold energy in the radiation screen is transmitted from the part to the whole through solid conduction. Therefore, when the area of ​​the radiation screen is large, the cooling time becomes longer, and there will be a significant temperature difference on the cold screen, which affects the temperature of the cold screen. The effect of radiation protection has a certain influence

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