A liquid nitrogen freezer with slotted liquid supply pipe

Abstract

The invention discloses a liquid nitrogen freezer with grooved liquid supply pipes. The freezer comprises a freezing pipe, a liquid supply device and a gas exhaust pipe. The liquid supply device and the gas exhaust pipe are in sealed connection with the freezing pipe through a sealing plate. The liquid supply device comprises the first liquid supply pipe, the second liquid supply pipe and the third liquid supply pipe. A first spiral groove is formed in the first liquid supply pipe. A second spiral groove is formed in the second liquid supply pipe. A third spiral groove is formed in the third liquid supply pipe. A bottom plate is arranged at one end of the second liquid supply pipe in a sealed mode. According to the liquid nitrogen freezer, liquid is supplied to soil layers through the liquid supply device, the liquid outlet amount of nitrogen is changed through superposition of the first spiral groove, the second spiral groove and the third spiral groove, different amounts of the liquid nitrogen is supplied to the different soil layers, accordingly, the freezer adapts to the demanded amounts of the different soil layers for the nitrogen, and the liquid nitrogen freezer has the advantages that the freezing speed is high, the effect is good, the liquid nitrogen using amount is saved, the cost is lowered, and the construction period is shortened.

Description

technical field [0001] The invention relates to a liquid nitrogen freezer with grooved liquid supply pipes. Background technique [0002] The artificial freezing of liquid nitrogen is directly vaporized in the freezing tube, using the latent heat of vaporization and sensible heat of temperature rise of liquid nitrogen to realize refrigeration, absorbing the heat in the formation, and realizing the artificial freezing technology of rapid freezing of the soil layer, which belongs to the refrigeration category of physical state change. Liquid nitrogen freezing has the characteristics of simple structure, low freezing temperature, fast freezing speed, and high strength of frozen soil, so it is often suitable for freezing construction with tight construction schedule, especially in complex engineering geological conditions or some engineering accidents that require emergency treatment Among them, liquid nitrogen freezing can take advantage of its fast freezing speed. [0003] Wh...

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Problems solved by technology

[0004] The present invention is aimed at the problem that the opening size of the liquid supply pipe in the existing freezing technology cannot be changed according to different soil layers, resulting in uneven freezing of the soil layer around the freezing pipe, thus wasting nitrogen and increasing the freezing time. The opening of the liquid supply pipe is replaced with a spiral groove, which can change the liquid supply of the liquid supply pipe and adapt to the nitrogen demand of different soil layers, so that the surrounding soil can be frozen quickly and evenly, thereby saving the amount of liquid nitrogen. The purpose of saving costs and shortening the frozen construction period

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