4results about How to "Guaranteed freezing effect" patented technology

The utility model relates to the technical field of liquid nitrogen storage auxiliary devices, and particularly discloses a narrow-mouth liquid nitrogen tank cryopreservation basket convenient to rotate, the narrow-mouth liquid nitrogen tank cryopreservation basket convenient to rotate comprises a hanging assembly and a basket body, the hanging assembly comprises a stand column and a hanging handle rotationally connected to the upper end of the stand column, and a connecting block arranged in the longitudinal direction is welded to the lower end of the stand column; a supporting block is transversely welded to the lower end of the connecting block, a rotary supporting plate is movably connected to the longitudinal side wall of the connecting block, and a sliding groove is formed in the middle of the rotary supporting plate; the basket is slidably connected into the sliding groove of the rotary supporting plate, the upper end of the basket is fixedly connected with a connecting column with an internal thread in the vertical direction, the connecting column is arranged on the side, away from the stand column, of the basket, the upper end of the connecting column penetrates through the sliding groove, the connecting column is in threaded connection with a shifting rod, and the upper end of the shifting rod is provided with a connecting piece detachably connected with the stand column. The purpose of the utility model is to solve the problem that a basket which is placed later in an existing narrow-mouth liquid nitrogen freezing tank is easy to collide with a basket which is placed first in the rotating process.

The present application relates to the model test and engineering application technology field of artificial stratum freezing, and discloses a use method of a three-pipe winding type double-mode freezing device capable of accurately measuring temperature and controlling heat transfer process, which is used for flowing back to the ground from a liquid return pipe after low-temperature refrigerant flows into a liquid supply pipe of the freezing device, and flowing back to a liquid return device of a ground circulation system, so that the circulation process of the low-temperature refrigerant in the freezing device is completed; the three-pipe winding type double-mode freezing device comprises a liquid supply pipe, a temperature measuring steel pipe and a liquid return pipe; the temperature measuring steel pipe is installed between the liquid supply pipe and the liquid return pipe, the liquid return pipe and the liquid supply pipe are wound with each other, and the bottom ends of the liquid return pipe and the liquid supply pipe are connected to form a liquid refrigerant circulator. The direct connection mode of the liquid supply pipe and the liquid return pipe is adopted, the phenomenon that a refrigerant circulation blind area appears at the bottom of the freezing device is avoided, the freezing device is formed when the liquid supply pipe and the liquid return pipe have a smaller diameter, and the influence of the thickness of the liquid supply pipe wall on the refrigerant circulation space is reduced.

The application provides an underwater butt joint reinforcement method in a high water pressure and strong permeation stratum, relates to the field of shield construction, is suitable for underwater butt joint engineering of two large-diameter shield machines, has high safety for high water pressure and strong permeation strata, effectively meets special working conditions of limited underwater construction space, and specifically comprises the following steps: step 1, a plurality of radial grouting holes are arranged in a middle shield of the shield machine, a water stop curtain is formed around the shield machine through radial grouting, and a closed construction environment is provided for subsequent construction; step 2, a plurality of groups of inclined grouting holes are pre-buried on the shield shell, advanced grouting reinforcement is carried out, and the stratum is improved to facilitate the formation of a frozen wall; step 3, after the advanced grouting is completed, a freezing pipe is inserted into the inclined grouting hole to carry out freezing reinforcement; step 4, a pressure relief hole is reserved on the shield machine, the pressure relief hole is inclined through a shield air bubble bin, and the pressure relief hole is used to control the frost heaving force and the frost heaving amount; and step 5, after the freezing is completed, whether water leakage occurs is observed through the pressure relief hole to detect the freezing quality.

The utility model relates to the technical field of hematopoietic stem cell storage, in particular to a hematopoietic stem cell blood bag cryopreservation box which comprises a box body. The placing mechanism is arranged on the box body, the placing mechanism comprises two fixing blocks and a plurality of fixing boxes, through cooperation of a fixing frame, a hasp lock and the like, the multiple fixing boxes can be conveniently limited and fixed, cooperation of the fixing boxes, a cover plate, a protection cushion and the like is facilitated, blood bags are clamped and placed, and damage caused by collision of the blood bags is avoided; one blood bag can be independently taken out conveniently when the blood bags are taken out, a large amount of nitrogen is prevented from being released, nitrogen is further saved, through cooperation of a spring, a limiting block, a pull ring and the like, a cover plate can be conveniently limited and fixed, people can conveniently open or close the cover plate, then the blood bags are taken out, practicability is improved, liquid nitrogen is injected into a liquid nitrogen box through a liquid inlet, and use is convenient. Nitrogen can conveniently penetrate through the multiple air holes to freeze the two sides of the blood bag, and the freezing effect of the blood bag is guaranteed.