Does the cryopump need to be kept cold?

The charging pump in the air separation unit generally does not need to be insulated. The internal and backup pumps of the air separation unit need to be insulated. The main purpose of the insulation is as follows: 1. Reduce the loss of cold capacity, the cryogenic pump has a large relationship with the outside world during operation The temperature difference is very considerable when exposed directly to the atmosphere; 2. Excessive heat input may cause liquid flashing at the inlet of the pump and the pump body, causing pump cavitation; 3. Because the cooling capacity runs along the pump body Out, frost or icing on the outside of the pump may freeze some parts of the outside of the pump, or even block the blow-out outlet of the sealing gas of the pump, and the cold may even be conducted to the hot end; 4. Because the pump is exposed to the environment , There will be a lot of condensate on the ground of the pump installation site, which is not conducive to on-site management. However, the charging pump is not used continuously for a long time, and it does not make much sense to maintain the cooling capacity for a short time. The above factors are not very obvious, so there is no need to install a heat preservation pump box.