Efficient self-pressurized metering liquid nitrogen pump

Abstract

The invention discloses an efficient self-pressurized metering liquid nitrogen pump which comprises a sealing head, an outflow pipe and a pressurizing pipe. The outflow pipe and the pressurizing pipe are inserted in the sealing head in parallel. A data collector connected with a PC is arranged at the bottom of the pressurizing pipe. A heat insulation layer which is 5 mm in thickness is arranged at the outer portion of the outflow pipe so that heat exchange between air and the pressurizing pipe can be prevented, and it is ensured that liquid nitrogen stably flows out from the outflow pipe. A safety valve and a check valve are sequentially arranged on the outflow pipe. A flow meter is arranged on the pressurizing pipe. The air flow is adjusted through the flow meter so that the flowing speed of the liquid nitrogen in the outflow pipe can be adjusted. The data collector sends collected total mass data to the PC, the mass flowing speed of the liquid nitrogen in the outflow pipe is displayed through software data processing, and the liquid nitrogen is adjusted under cooperation of the flow meter to achieve even-speed outflow. Fierce heat exchange, caused by a concentric tube between air and outflow liquid nitrogen, between the air and the outflow liquid nitrogen in a traditional liquid nitrogen pump is avoided, excessive vaporization of the liquid nitrogen in the outflow pipe can be prevented, and the liquid nitrogen outflow quality and speed are improved. The efficient self-pressurized metering liquid nitrogen pump is simple in structure, convenient to operate and good in use effect.

Description

technical field [0001] The invention relates to a self-boosting liquid nitrogen pump, in particular to a separate self-boosting metering liquid nitrogen pump suitable for high-efficiency outflow of liquid nitrogen. Background technique [0002] The traditional liquid nitrogen pump adopts the concentric tube structure of the outlet tube and the booster tube. During the intake process, the normal temperature air flows in from the inner tube or the outer tube, and the low temperature liquid nitrogen flows out from the outer tube or the inner tube. On the one hand, the air at normal temperature is cooled by liquid nitrogen, and the temperature drops, which inhibits the process of air at normal temperature entering the liquid nitrogen tank for intense heat exchange to generate nitrogen, and slows down the pressure increase in the tank, affecting outflow velocity. On the other hand, the low-temperature liquid nitrogen is heated and vaporized by the normal temperature air, which i...

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Problems solved by technology

[0002] The traditional liquid nitrogen pump adopts the concentric tube structure of the outlet tube and the booster tube. During the intake process, the normal temperature air flows in from the inner tube or the outer tube, and the low temperature liquid nitrogen flows out from the outer tube or the inner tube. On the one hand, the air at normal temperature is cooled by liquid nitrogen, and the temperature drops, which inhibits the process of air at normal temperature entering the liquid nitrogen tank for intense heat exchange to generate nitrogen, and slows down the pressure increase in the tank, affecting outflow velocity

On the other hand, the low-temperature liquid nitrogen is heated and vaporized by the normal temperature air, which increases the nitrogen composition in the outflow pipe, which cannot meet the requirements of the experimental device for liquid nitrogen composition.

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