Coaxial supply and return liquid pipe freezer

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...

AI Technical Summary

Problems solved by technology

[0006] 1) The full-deep freezing technology can still meet the needs of current freezing projects at the technical level during the construction of extra-thick alluvium freezing wells in the eastern region, but from an economical point of view, there is a serious waste of cooling capacity, which is not consistent with the current national sustainable development. The development strategy does not match

[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 type of 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, and as the freezing depth increases and the upper part needs a heat preservation section The increase of the liquid supply pipe 1 and the liquid return pipe 10 need to increase the length. 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, exceeding its withstand pressure If the capacity is damaged, if the flow rate and pressure are reduced, the expected freezing effect cannot be achieved. If the diameter of the liquid supply pipe 1 and the liquid return pipe 10 is increased to reduce the pressure in the pipe, the diameter of the freezing pipe 3 needs to be increased. It causes an increase in the amount of steel used, and increases the difficulty of freezing holes and increases the cost of the project; the main problem is that the diameter of the freezing pipe required for use in deep well freezing projects increases, resulting in an increase in the amount of steel used, and increases the cost of freezing holes. Difficulty, increase engineering cost

Images