Vacuum pumping device for interlayer of cryogenic insulation cylinder

Abstract

The invention relates to a vacuum pumping device for an interlayer of a cryogenic insulation cylinder, which belongs to the technical field of cryogenic insulation vacuum. The vacuum pumping device is mainly technically characterized by comprising the cryogenic insulation cylinder, a heating oven, an internal air circulating fan, a combustion machine, a heating branch pipe, an exhaust branch pipe, an internal heating main pipe, an external exhaust main pipe, a nitrogen heating device, a nitrogen displacement valve, a pneumatic flapper valve I, a pneumatic flapper valve II, a diffusion pump, a pneumatic flapper valve III, a rotary vane pump and a Roots pump, wherein the internal air circulating fan is used for introducing heated high-temperature air into the interlayer of the cylinder. The two surfaces of an outer cylinder body and an inner liner are heated simultaneously, so that hydrogen, helium and other low molecular weight gas molecules, water molecules and the like, which are adsorbed in a heat insulation material in the interlayer, can be activated, the gas release speed of the interlayer is enhanced, and the vacuum pumping speed of the interlayer is effectively improved. The vacuum pumping device has the advantages of reasonable structure, safety and convenience in use, high vacuum pumping degree, no re-bounce of vacuum degree, long holding time and the like.

Description

technical field [0001] The invention relates to a low-temperature heat-insulating gas cylinder interlayer vacuum device, which belongs to the field of low-temperature heat-insulation vacuum technology. Vacuum down. Background technique [0002] As special equipment for transporting and storing cryogenic liquefied gases, cryogenic insulated gas cylinders have been widely used to contain various cryogenic liquefied gases such as liquefied natural gas, liquid nitrogen, liquid oxygen, and liquid hydrogen. Cryogenic insulated gas cylinders generally adopt the vacuum double-layer insulation method. The sealed interlayer between the inner and outer containers is a vacuum insulation layer. It is the most critical factor affecting the performance of cryogenic insulating gas cylinders. In order to ensure sufficient storage time of liquefied gas in the bottle, it is necessary to pump the vacuum degree of the insulating sealing interlayer of the insulating gas cylinder to higher than 2...

AI Technical Summary

Problems solved by technology

In the background technology, due to the deflation of the stainless steel material of the outer cylinder of the cryogenic insulating gas cylinder under vacuum, and the multi-layer insulating material filled in the sealing interlayer is mostly a porous medium with strong air absorption, when using a traditional vacuum device, Because it only heats the outer cylinder of the gas cylinder, it cannot effectively activate the hydrogen, helium and other small molecular weight gas molecules adsorbed in the insulating material of the gas cylinder interlayer, as well as the adsorbed water molecules, etc., resulting in too long vacuuming time for the gas cylinder interlayer , and the effect is not good

Images