A vacuum pumping method and vacuum pumping device for a low-temperature tank car

Abstract

The invention discloses a vacuum pumping method and a vacuum pumping device for a low-temperature tank car, which belong to the field of vacuum pumping, and include an outer box body, an inner cavity is arranged in the outer box body, a sealed box body is fixedly arranged in the inner cavity, and a sealed box body is fixed in the sealed box body. The mouth of the suction pipe set in the body is connected to the main pipe, and several compartments are set in the sealed box, and the side of the sealed box is fixedly connected to the controller, which is convenient for quick positioning and maintenance, and the sealed compartments can reduce the The problem of long vacuuming time caused by air tightness, by setting up a backup suction pump, can continue to vacuumize the inside of the tank when the main components of vacuuming cannot work and be used normally. When the pressure of the suction port is lower than the pressure of the discharge port, the air intake control valve is controlled to open, and the replacement gas is filled into the tank body, which can greatly reduce the water vapor entering the vacuum interlayer of the tank body.

Description

technical field [0001] The invention belongs to the field of vacuuming, in particular to a vacuuming method and a vacuuming device for a low-temperature tank car. Background technique [0002] Cryogenic tank trucks mainly transport low-temperature media such as liquid nitrogen, liquid oxygen, liquid argon, and LNG. With the rapid development of society and economy, the demand for low-temperature transportation media is increasing. The low-temperature media should be kept as liquid as possible during transportation. One is to prevent the pressure rise caused by vaporization, and the other is to safely discharge the pressure rise after vaporization, resulting in a waste of energy resources. In order to maintain the liquid state of the low-temperature medium, it is necessary to do a good job of heat insulation for the tank body, and use the interlayer to set up a vacuum layer It is the best way at present, and the vacuum degree detection of the vacuum layer is one of the key in...

AI Technical Summary

Problems solved by technology

[0003] At present, when the vacuum degree is found to be unqualified, except for a few large-scale inspection agencies and users who have vacuum equipment, a third party is required to provide vacuum service. Usually, the vehicle is returned to the factory for vacuum extraction, and the cost of returning the vehicle to the factory is expensive. It takes a lot of time

[0004] Even if the unit has vacuum extraction equipment, because of the volume of the tank and the need for a high vacuum environment, the extraction of high vacuum has very high requirements for the extraction equipment, and the extraction process takes a long time and consumes a lot of energy.

[0005] In the process of vacuuming, if there is a leak between the equipment, it will also affect the time of vacuuming, especially when pumping high vacuum. When vacuuming, the vacuum interlayer in the low-temperature tanker will absorb the outside air, and the inhaled air contains a lot of moisture, which will make the next vacuuming time longer

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