Vacuum-pumping method and apparatus thereof

A vacuuming device and vacuuming technology, applied in the direction of liquid variable capacity machinery, machines/engines, mechanical equipment, etc., can solve problems such as difficult operation, low heat energy utilization rate, and reduced interlayer vacuum degree, so as to achieve the goal of not easy to lose heat energy The effect of high utilization rate and reduction of manufacturing cost

Active Publication Date: 2007-08-22
CIMC VEHICLES (GROUP) CO LTD
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Problems solved by technology

Although this method can achieve the vacuum degree required by the specification, because the vacuum itself has thermal insulation properties, it is difficult for external heating to transfer heat to the thermal insulation material, and the entire heating replacement vacuum pumping process takes a long time; The gas is filled into the interlayer for heating and replacement, such as a method for vacuuming a liquefied natural gas storage tank for replacing air disclosed in CN03152769.8, but this method has a low thermal energy utilization rate and is not easy to operate. It is only used for containers with low vacuum requirement

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  • Vacuum-pumping method and apparatus thereof

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Embodiment Construction

[0024] Hereinafter, preferred embodiments according to the present invention will be described with reference to the accompanying drawings.

[0025] As shown in FIG. 1 , it is a schematic structural diagram of a vacuum device according to a preferred embodiment of the present invention. The vacuum device according to the present invention is used to evacuate the interlayer between the outer cylinder and the inner cylinder of the multilayer heat insulation container, wherein the interlayer between the outer cylinder and the inner cylinder is filled with heat insulating material, and the high vacuum multilayer heat insulation container It can be used in cryogenic storage tanks, tank boxes or tank cars. The vacuum pumping device comprises: a first gas conveying device 7, which has an air outlet; a first gas heater 6, whose inlet is connected with the gas outlet of the first gas conveying device 7, and whose outlet is connected with the air inlet of the inner tube 4 A is connecte...

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Abstract

The present invention discloses an evacuation method and its equipment for evacuating sandwich between external barrel and internal barrel of multi-layer heat-insulating container. Said evacuation equipment includes first gas-conveying device, it has a gas outlet; first gas heater, its inlet is communicated with gas outlet of first gas-conveying device, its outlet is communicated with gas inlet of said internal barrel; evacuation machine unit, it is communicated with said sandwich; second gas-conveying device, it has a gas outlet; and second gas heater, its inlet is communicated with gas outlet of said second gas-conveying device, and its outlet is communicated with said sandwich.

Description

technical field [0001] The invention relates to a vacuum pumping method and its device, in particular to a vacuum pumping method and its device which can significantly improve the vacuum pumping efficiency and vacuum degree. Background technique [0002] Cryogenic liquid storage tanks, cryogenic liquid tanks, and cryogenic liquid tank trucks for storage of liquid nitrogen, liquid oxygen, liquid hydrogen, liquid argon, and liquefied natural gas that require extremely high insulation performance at home and abroad, the insulation form is mostly high-vacuum multi-layer insulation , the vacuum degree must be below 0.03Pa absolute pressure. For cryogenic liquid storage tanks of tens of square meters, the vacuuming time of the interlayer itself is very long, and because the heat insulating material in the interlayer has strong air absorption and large suction resistance, the moisture absorbed in the heat insulating material is difficult to extract. There are two common existing ...

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Application Information

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IPC IPC(8): F04B37/06F04B37/14
Inventor 施才兴唐家雄童杰东杨进
Owner CIMC VEHICLES (GROUP) CO LTD
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