The invention relates to a vacuum-pumping system and a vacuum-pumping method for a large-capacity low-temperature thermal insulating container. The system comprises an air supplying device, a vacuum-pumping device and a heating device, wherein the heating device comprises an outer tank heating device and an inner tank heating device; a thermal insulating container to be pumped comprises an outer tank, an inner tank and an interlayer formed by the outer tank and the inner tank; the outer tank heating device is arranged outside the outer tank of the thermal insulating container to be pumped; the inner tank heating device is arranged inside the thermal insulating container to be pumped; the air supplying device is communicated with each of the inner tank and the interlayer of the thermal insulating container to be pumped through a pipeline; and the vacuum-pumping device is communicated with the inner tank and the interlayer of the thermal insulating container to be pumped by pipelines. The invention provides the vacuum-pumping method for the large-capacity low-temperature thermal insulating container, and with the adoption of the method, the vacuum-pumping period of the container is shortened, and water and oily gas inside the interlayer can be thoroughly replaced with low cost.

Vacuum-pumping system and vacuum-pumping method for large-capacity low-temperature thermal insulating container

The invention discloses an exhaust method for obtaining ultrahigh vacuum. The method comprises sequentially performing nitrogen cleaning and pre-vacuumization with a dry pump on a vacuum chamber; after performing the vacuum-nitrogen-cleaning three-times, vacuumizing the vacuum chamber through the dry pump, a molecular pump, an ion pump and a titanium sublimation pump, during which heating and heat preservation are performed on the vacuum chamber and the ion pump, and after the vacuum chamber decreases to the room temperature, cooling the vacuum chamber through liquid nitrogen to reduce the internal pressure of the vacuum chamber to a magnitude of 10-10Pa. The exhaust method for obtaining the ultrahigh vacuum has low requirements on rough vacuumization and does not require additional expensive equipment but simply high-purity gas nitrogen, thereby being low in cost. Besides, the exhaust method for obtaining ultrahigh vacuum is easy to operate and can help obtain ultrahigh vacuum degrees.

Exhaust method for obtaining ultrahigh vacuum

Vacuum-pumping system for multiple-dewar interlayer and vacuum-pumping method thereof

The invention discloses a low-temperature heat-insulation gas cylinder vacuumizing system. The low-temperature heat-insulation gas cylinder vacuumizing system comprises a plurality of gas cylinders arranged in a vacuum heating chamber, wherein the gas cylinder sandwich layers are communicated with a vacuumizing device, and air inlet joints are arranged on gas cylinder outer containers and are sequentially communicated with a sandwich layer heating tank, a dehumidifier and a compressed air inlet pipe through a pipeline.

Low-temperature heat-insulation gas cylinder vacuumizing system

The invention provides vacuumizing technology for a vacuum low-temperature thermal insulation pipeline, which is as follows: when the low-temperature thermal insulation pipeline is vacuumized, nitrogen gas is used for replacing the air in the pipeline so as to reduce moisture and other foreign substances in the vacuum interlayer to the greatest extent, achieve a higher vacuum degree and reduce the cold loss of the low-temperature liquid The vacuumizing technology for a vacuum low-temperature thermal insulation pipeline satisfies the large-scale production of vacuum low-temperature thermal insulation pipes and the requirements of simultaneously vacuumizing a plurality of vacuum pipes

Vacuumizing technology for vacuum low-temperature thermal insulation pipeline

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

Jiedong Dong

Papers

Vacuum-pumping method and apparatus thereof