Liquid Helium Dewar: How to solve the air leakage problem inside cryogenic equipment?

One of the commonly used coolants for cryogenic equipment is liquid helium. Liquid helium can reduce the temperature to below tens of millikelvin and is an important substance used in many laboratories and research institutes for superconducting and low-temperature experiments. However, in cryogenic equipment, liquid helium is prone to leakage problems, which can lead to inaccurate experimental results and even damage to the equipment. This article will introduce some methods to solve the problem of air leakage inside cryogenic equipment.

1: Use high-quality liquid helium

Liquid helium is extracted from natural gas and contains a certain amount of impurities. These impurities may accumulate in liquid helium pipes and containers, causing blockages or corrosion that can lead to gas leaks. Therefore, the use of high-quality liquid helium is the solution to the gas leakage problem

Currently, there are many suppliers on the market that provide high-quality liquid helium from which you can choose to purchase. At the same time, attention should be paid to filtering and testing liquid helium before use. This can help reduce the impact of impurities and ensure the stability of equipment operation.

2: Check equipment regularly

　　Air leakage problems in cryogenic equipment are often caused by poor connections between components or worn parts. Therefore, regularly inspecting the equipment to determine whether worn parts need to be replaced or components reconnected is an important step in solving air leak problems.

When inspecting equipment, you can use instruments such as handheld detectors to determine the location and size of gas leaks. During the testing process, care should be taken to avoid damage to the equipment. If an air leak is discovered, immediate steps should be taken to repair it.

3: Add seal

Sealing is one of the effective ways to reduce air leakage in cryogenic equipment. This can be achieved through special handling of equipment piping and vessels.

A common sealing method is to spray Dewar coating inside the equipment. The coating can reduce gas leakage and improve the sealing of the equipment. In addition, the same effect can be achieved using Dewar wrapping equipment.

In addition, sealing materials such as Teflon can also be applied to pipes and containers. These materials have excellent waterproof, oil-proof, anti-corrosion and high-temperature resistance properties, which can effectively improve the sealing performance of the equipment and reduce air leakage problems.

Liquid helium is a commonly used coolant for cryogenic equipment and has broad application prospects. However, attention needs to be paid to air leakage during use to ensure equipment safety and accuracy of experimental results.

Using high-quality liquid helium, regularly checking equipment, and taking sealing measures are effective ways to solve the problem of air leakage in cryogenic equipment. In practice, it is necessary to select appropriate solutions based on the characteristics and needs of different equipment to ensure stable operation of the equipment and accuracy of experimental results.