5results about How to "Increase freezing rate" patented technology

The invention discloses a temperature control system of an immersion type freezing device and relates to the technical field of immersion type freezing temperature control. Temperature control in the dipping and freezing process is achieved, it is ensured that large ice crystals are reduced in the food freezing process, damage to the interior of food is reduced, and meanwhile energy consumption and cost are reduced. The system comprises a temperature acquisition module, a liquid pump driving module, an upper computer, a data transmission module, a control module and a refrigeration equipment control module, the upper computer performs data interaction with the control module through the data transmission module; the temperature acquisition module acquires the temperature of the frozen object and the external environment, converts the acquired temperature signal into an electric signal and sends the electric signal to the control module; the control module controls the power of the liquid pump driving module through a cascade control strategy and a PID (Proportion Integration Differentiation) control algorithm according to the temperature signal of the frozen object and the influence value of the external environment on the freezing liquid; and starting and stopping of the refrigeration equipment control module are controlled according to the real-time temperature of the frozen object. The method is suitable for the field of dipping type freezing temperature control.

The invention relates to the technical field of fish meat freezing and fresh-keeping, in particular to refrigerating fluid capable of remarkably improving the fish meat freezing quality. The refrigerating fluid is prepared from the following components in percentage by mass: 10 to 15 percent of ethanol, 1 to 3 percent of chitosan, 1.0 to 2.5 percent of rhizoma polygoni cuspidati extract, 0.05 to 0.15 percent of spearmint extract, 2 to 5 percent of malic acid and the balance of deionized water. The freezing method is dipping freezing, the fish meat is dipped in a pre-cooled freezing liquid and then is subjected to cryopreservation, and the freezing temperature is-18 DEG C to-38 DEG C. The preparation method of the refrigerating fluid comprises the following steps: adding the chitosan into the malic acid and the deionized water, and uniformly stirring to obtain a solution A; sequentially adding ethanol and spearmint extract into the solution A, and stirring; and adding the polygonum cuspidatum extract, stirring and homogenizing. According to the freezing liquid, the freezing rate of fish meat can be remarkably increased, mechanical damage to muscle fibers caused by repeated formation of ice crystals is greatly reduced, the influence of temperature fluctuation on the quality of the fish meat is reduced, and the influence of freezing on the quality of the fish meat is reduced to the maximum extent.

The refrigerating machine with the liquid nitrogen cooling function comprises a base, an alcohol box is fixedly connected to the upper surface of the base, a circulating pump is arranged on the upper surface of the alcohol box, the output end of the circulating pump is fixedly connected with a conveying pipe, and a stainless steel plate heat preservation box is fixedly connected to the upper surface of the base. A box door is arranged on the front surface of the stainless steel plate heat preservation box, and a liquid nitrogen tank is fixedly connected to the upper surface of the stainless steel plate heat preservation box. Through arrangement of a liquid nitrogen tank, a cold conveying pipe, a stop valve, a liquid nitrogen box, a connecting plate and an air hole, the freezing rate of alcohol in a conveying pipe can be greatly increased, so that the using effect of the equipment is improved, and through arrangement of a connecting shaft, fan blades, a synchronous wheel, a belt, a driving motor and a rotating shaft, cold air emitted by liquid nitrogen in the liquid nitrogen box can be diffused; therefore, it is ensured that objects in the stainless steel plate heat preservation box can be evenly and rapidly cooled, and then the cooling effect is improved.

This disclosure relates to the field of cryopreservation technology for biological samples, and in particular to a cryopreservation tube assembly, comprising a cap, a tube body, and a carrier. The cap is detachably connected to the tube body, and the carrier is connected to the cap. The carrier has a bearing surface for holding a target sample, and the bearing surface is provided with a through hole for positioning the target sample. The bearing surface can extend into the tube body to place the target sample inside the tube. In use, the target sample is placed at the position of the through hole, allowing the target sample to fully contact the freezing medium, thus improving the freezing rate. Furthermore, it also improves the thawing rate during thawing, making the target sample easier to detach, which is beneficial for maintaining the sample's recovery rate and viability.

The invention discloses a dipping type freezing process control method and a dipping type freezing process control system, relates to the technical field of dipping type freezing control, and is used for reducing the formation of large ice crystals in a freezing process of food so as to reduce the damage to the interior of the food and reduce energy consumption and cost at the same time. The control method comprises the following steps that S1, the freezing process of a frozen object is divided into three stages including the pre-cooling stage, the phase change stage and the supercooling stage; and S2, the flow speed of the secondary refrigerant is controlled to be low in the precooling stage and the supercooling stage, and the flow speed of the secondary refrigerant is controlled to be high in the phase change stage. Furthermore, the flow velocity smaller than or equal to 4 m / s is low, and the flow velocity larger than 4 m / s is high. The method is suitable for the field of dipping type freezing control.