LNEYA-Ultra-low Temperature Freezer
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WUXI GUANYA REFRIGERATION TECHNOLOGY CO., LTD. Ultra-low Temperature Freezer Pharmaceutical freezer design, medicine freezer installation, medical-use freezer construction, strictly abide by the relevant standards of the Food and Drug Administration on medical freezer, high-quality and high-standard construction of the freezer project related to the pharmaceutical industry, cooperate with the enterprise to pass the GSP and GMP certification. For pharmaceutical manufacturers, the medical freezer designed and constructed by our company is highly efficient and energy-saving, and the product has high environmental protection and flame retardant performance. In the later use process, the maintenance cost of the medical-use freezer is reduced to an ultra-low level. (Medical low temperature freezer project that is within 100 cubic meters) 1N Medical-use freezer temperature range(°C) Low temperature refrigerator: -20°C ~ -50°C used to preserve plasma, biological materials, vaccines, reagents, etc. Ultra low temperature freezer: -50 0 C ~ -100 0 C can be used to preserve placenta, semen, stem cells, plasma, bone marrow, biological samples. 2 % Performance and parameters of polyurethane insulation board 2.1, Insulation performance of freezer insulation materials : The first requirement of polyurethane insulation material is the insulation performance, and the thermal insulation performance can not be observed with the naked eye before it is actually put into use. It is too late to observe the difference in power consumption. The company has strictly controlled the selection of materials through a large number of experimental tests in order to achieve this goal : Use structural amine ether to reduce thermal conductivity and improve insulation effect; The water content should be reduced as much as possible in various raw materials and formulations to avoid deterioration of thermal insulation performance caused by water foaming; Main material polyether: Select the products of the large-scale factory after strict processing (such as Jinling Petrochemical Company, etc.), compared with the polyether of the small factory without post-treatment, the foam hole is uniform and the cell walls are thin. Insulation performance is significantly better than ordinary foam with thick-walled large holes; The use of high-efficiency and odorless amine catalysts, the balance of the foaming-gel reaction is adjusted efficiently, and the skin between the sprayed layers is thinner, which is beneficial to the performance of the cold storage insulation material. Ordinary polyamine polyols is not used. These control measures have received quite good results. Compared between several freezers in a customer in Jining, the freezer that uses the white materials consumes significantly lower power than other freezers that uses white materials from other manufacturers. 2.2, Dimensional stability of polyurethane insulation foam : Cold polyurethane foams undergo dimensional changes (typically shrinkage) when subjected to severe temperature changes or at low temperatures for extended periods of time. Dimensional changes often manifest as foam cracking or shedding, which inevitably affects the normal use of the cold storage. In addition to regular performance testing of simulations, more emphasis is placed on the control of selecting quality materials: The special high-functionality polyether is compounded to make the foam form a three-dimensional network structure, which greatly improves the low temperature resistance of the foam. However, the 4110 polyether commonly used in spray coatings contains a large amount of difunctional components, and a large amount of the linear molecular structure that formed after reaction is difficult to stabilize at low temperatures; 75 www.lneya.com The use of high functionality crosslinkers also greatly increases the dimensional stability of the foam. The selected polyether is catalyzed by strong base in the production stage, and the reaction is thorough, so that the polyether maintains a high reaction rate (that is, it can react more completely when it is in contact with the black material); some manufacturers do not produce deformation in order to achieve foam performance. The addition of the openable component to the foaming material reduces the closed cell ratio of the foam and achieves a stable size, but at the expense of the thermal insulation properties of the polyurethane cold storage insulation foam. 2.3, Polyurethane freezer insulation foam life : In addition to the initial basic properties of polyurethane foam, the performance degradation of the foam is also an important indicator. In the preparation of white materials, some polyester materials have a good toughness and impact resistance on the surface, but they become brittle after being used for a period of time in the cold storage, and no longer resist impact and collision; The poor hydrolysis resistance of the polyester structural foam also affects the service life of the foam; it adopts a polyether structure, and although it is slightly brittle at the initial stage, the brittleness disappears after a few days, and the stable performance of the thermal insulation material of freezer is maintained for a long time. 2.4, Main technical performance indicators of polyurethane Items Standard Requirement Actual Measurement 3, Electrical control part: The function of automatic switching of the dual control circuit of the external control cabinet of the medical-use freezer is usually referred to as (conventional power supply and standby power supply); Control the main compressor and sub-compressor to automatically switch, Siemens PLC, 7-inch color touch screen, with automatic monitoring, regulation, display, temperature upper limit and lower limit alarm function. Record the temperature, use ultra-advanced temperature and humidity recorder, remote SMS alarm. 4, Refrigeration part: Cold storage refrigeration equipment: mainly the selection of freezer compressors and evaporators. The low-temperature freezer adopts the Italian Dorin semi-closed compressor, copper tube aluminum fin heat exchanger, and the main refrigeration accessories are all well-known brands such as Emerson, Danfoss and Castor.