Freezing device with coaxial liquid supply pipe and liquid return pipe

Abstract

A freezing device with a coaxial liquid supply pipe and a liquid return pipe comprises the liquid supply pipe, the liquid return pipe and a freezing pipe. The liquid supply pipe and the liquid return pipe are made of polyethylene plastic or polyvinyl chloride. The freezing pipe is a hollow cylindrical pipe. The bottom end of the freezing pipe is sealed through a lower sealing plate. The lower end of the lower sealing plate is provided with a base cone. A first liquid return valve is arranged at the part, extending out of the freezing pipe, of the liquid return pipe. A second liquid return valve is arranged on the outer side of the upper end of the freezing pipe. The liquid supply pipe is provided with a liquid supply valve. The space positions of the liquid supply pipe and the liquid return pipe in the freezing pipe are changed, and pressure of saline water in the liquid supply pipe is effectively reduced on the premise of not increasing the diameter of the freezing pipe and the saline water flow. Meanwhile, the effect of controlling transmission of cold flow is achieved, and as the liquid supply pipe is arranged in the liquid return pipe, the cold flow transmission efficiency of the liquid supply pipe is improved.

Description

technical field [0001] The invention relates to the technical field of artificial freezing, in particular to a coaxial liquid supply and return pipe freezer. Background technique [0002] The freezing method originated from natural freezing, and due to the development and application of artificial refrigeration technology, artificial freezing was produced. Traditionally, the more common artificial freezing method is to use the indirect refrigeration method of salt solution, which is to freeze the salt (such as CaCl2) solution through a freon (or ammonia) refrigeration compressor, reduce it to a low-temperature solution, and use it as a refrigerant to bury it in the soil. It circulates in the pipeline, exchanges heat with the soil, absorbs the heat of the soil, increases its own sensible heat, and freezes the surrounding soil through continuous cooling to achieve the purpose of strengthening and stabilizing the soil. Using artificial refrigeration to strengthen the soil (fre...

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Problems solved by technology

[0007] 2) In the process of well construction in the soft rock area in the west, due to the relatively insufficient understanding and experience of engineering geology and hydrogeology in the western region, the hydrogeological data of the well inspection hole are inaccurate, and the predicted wellbore water inflow provided is not consistent with the actual wellbore inrush during the excavation process. The amount of water is seriously inconsistent, causing well flooding accidents are common, and the wellbore with problems basically needs to use the freezing method for the next step of construction

[0009] This freezer has the following defects: the liquid supply pipe 1 and the liquid return pipe 10 are placed side by side in the freezing pipe. Both need to be increased. Under the premise that the flow rate of the freezer remains unchanged, the pressure in the liquid supply pipe 1 and the liquid return pipe 10 will increase, and damage will occur if the pressure resistance capacity is exceeded. If the flow rate and pressure are reduced, it will not reach To achieve the expected freezing effect, if the diameters of the liquid supply pipe 1 and the liquid return pipe 10 are increased to reduce the pressure inside the pipes, the diameter of the freezing pipe 3 needs to be increased, resulting in an increase in the amount of steel used, and increasing the difficulty of freezing holes. Engineering cost; the main problem is that the diameter of the freezing pipe required in the deep well freezing project increases, resulting in an increase in the amount of steel used, and increasing the difficulty of freezing holes and increasing the engineering cost

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