SpemblyDFS30型冷冻机是由英国生产的一种利用液氮从液态变成气态时在冷冻头上产生低温进行冷冻治疗的仪器。它包括电路系统和液氮、氮气传送系统两部分。该机因使用太久，电路和控制部分的故障，经多次修理，仍能保持良好的状态，但冷冻性能越来越差，以致在冻头上不能制冷， SpemblyDFS30 type freezer is produced in the United Kingdom by the use of liquid nitrogen from the liquid into the state of the cryogenic cryogenic cryogenic freezing treatment equipment. It includes circuit and liquid nitrogen, nitrogen transmission system in two parts. The machine used for too long, the circuit and control part of the fault, after repeated repairs, still maintain a good condition, but the freezing performance is getting worse, so that the refrigerant can not be frozen,