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Experimental Vacuum Freeze Dryer
  • Experimental Vacuum Freeze Dryer
  • Experimental Vacuum Freeze Dryer
  • Experimental Vacuum Freeze Dryer
  • Experimental Vacuum Freeze Dryer

Experimental Vacuum Freeze Dryer

Product Category: Experimental Vacuum Freeze Dryer
Place of Origin: Made in China
Price: 1700-350000USD/set
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The experimental vacuum freeze dryer uses a physical principle to freeze the moisture in the compressed air below the dew point to precipitate it out of the air. Limited by the freezing point temperature of water, in practice its dew point temperature can be close to 0 degrees. The dew point temperature of a good experimental vacuum freeze dryer is usually about 5 degrees. The intuitive appearance of zui is that the refrigerant pressure gauge is zero.
The experimental vacuum freeze dryer leaks fluorine first to find the leak point. When checking the leak point, it needs patience and a certain way.
First use the visual method, open the machine box to look inside the machine, because the refrigerant will be mixed in the compressor when running, if the freon leaks will bring the smooth oil out, then carefully observe the inside of the machine, if there is The flaky oil stain belt is likely to be the leak point.
Then check the capillary copper tube inside the machine, that is, the thin copper tube and process tube below 6 mm, there is no break.
After passing the above basic review, mark the doubts. Then it is necessary to confirm the leak by adding an inert gas of a certain pressure. In the case of premise, zui is good to use nitrogen to maintain pressure, and there is no gaseous freon with nitrogen. It is strictly forbidden to check for leaks with oxygen.
When holding pressure, the starting end should be slowly involved in the gas. Observe the pressure of the refrigerant in the experimental vacuum freeze dryer while pressurizing. When the pressure is about 0.2Mpa, the pressure will be temporarily ended. Then carefully listen to the sound of the air leak inside the machine. You can find the leak by the location of the sound. If not, continue to pressurize to 0.4-0.5Mpa. Then find a sponge and apply soapy water, check in the place where you have doubts, and then check all the connections inside the machine. If there is a leak, there will be a bubble blowing out. This process needs to be very careful.
If the leak is still not found by the above method, it is likely that the evaporator is leaking. First of all, it must be confirmed that it can be confirmed by disconnecting the evaporator from the refrigeration system and then holding the pressure separately. If the pressure is reduced after the pressure is maintained by itself, it can be confirmed.
After finding the leak point of the experimental vacuum freeze dryer, it is trapped. According to the difference of the leak point, the leak point should be tightened accordingly. If it is a leak point of the copper tube welding type, brazing should be used. Brazing trapping is a common technique in the refrigeration repair industry. The so-called brazing is to use oxygen and acetylene flames to heat.

Analysis of the principle of refrigerant circulation in experimental vacuum freeze dryer:
1. After the start-up, the refrigerant is compressed by the compressor from the low temperature and low pressure state to the high temperature and high pressure steam.
2. The high-temperature and high-pressure steam flows into the condenser and the secondary condenser, and the heat is taken away by the cooling medium through heat exchange, and the temperature is lowered, and the high-temperature and high-pressure vapor becomes a normal-temperature high-pressure liquid because of condensation.
3. The liquid refrigerant at normal temperature and high pressure flows through the expansion valve, because the throttling pressure of the expansion valve is lowered, so that the refrigerant becomes a liquid at normal temperature and low pressure.
4. After the liquid at normal temperature and low pressure enters the evaporator, the liquid refrigerant evaporates and becomes a low-pressure and low-temperature gas due to the pressure drop. When the refrigerant evaporates, it absorbs a large amount of heat of the compressed air, so that the temperature of the compressed air drops to the purpose of drying.
5. The low-temperature and low-pressure refrigerant vapor after evaporation flows back from the suction port of the compressor, is compressed and compressed, and is discharged to the next cycle.Experimental Vacuum Freeze Dryer technology is mainly used in:
(1) freeze-drying of biological products with poor thermal stability, biochemical products, blood products, genetic engineering products, etc.;
(2) To maintain the structure and activity of biological tissues, the treatment of biological tissues such as cortex, bone, cornea and heart valve for surgery; (3) Coffee to maintain food color, aroma, taste and nutrients, and to quickly rehydrate Freeze-drying of seasonings, meat, seafood, fruits and vegetables;
(4) Application in microcapsule preparation, drug controlled release materials, etc. Processing of health products such as ginseng, royal jelly, and turtles and Chinese herbal preparations to maintain the invariability of fresh substances;
(5) Ultrafine powder functional materials such as: optical fibers, superconducting materials, microwave dielectric materials, magnetic powders, and treatment of catalysts capable of accelerating reaction engineering.

The experimental vacuum freeze dryer uses refrigeration technology to cool the compressed air to a certain zero temperature, so that the contained steam is condensed into a liquid state, and the condensation is carried out under the action of gravity sedimentation, impact, centrifugation and dispersion through a unique structural system inside the machine. The droplets and the majority of the solid particles and oil droplets remaining in the compressed air after the initial treatment of the main filter are highly accumulated, separated from the compressed air by a high-efficiency separator, and passed through an automatic drainer or periodically. The discharge is discharged outside the machine to obtain a water-free, high-purity compressed air with a minimum amount of dust (oil), so that the pneumatic system maintains a good working condition. The experimental vacuum freeze dryer is a good processing equipment for all kinds of air compressors. It is an ideal clean air source equipment for pneumatic control, pneumatic tools, painting and painting precision machinery, food packaging, textile and chemical industry.
The experimental vacuum freeze dryer is based on the principle of freezing and dehumidification, using a fully enclosed compression refrigeration system to cool and cool the compressed gas discharged through the air compressor, so that a large amount of saturated water vapor and oil mist contained therein are condensed and droplets pass through the soda water. After separation, it is discharged by the automatic drainer. The saturated compressed gas at a higher temperature enters the pre-cooler of the experimental vacuum freeze dryer, and exchanges heat with the dry cold gas from the evaporator in the pre-cooler to lower the temperature and enter the refrigeration system. The evaporator exchanges a second heat exchange with the refrigerant vapor to lower the temperature of the evaporator to a temperature close to the evaporation temperature of the refrigerant. During the two cooling processes, the water vapor in the compressed gas is condensed into liquid water droplets and enters the gas and water separation with the gas stream. The separated liquid water is discharged out of the machine through the automatic drainer, and the dry compressed gas with a lower temperature enters the pre-cooler to exchange heat with the newly entered wet saturated gas, so that the temperature thereof is improved, thereby freezing and drying in the experimental vacuum. The machine exhaust port obtains a dry compressed gas with a low water content and a relatively low relative humidity.

Analysis of the principle of refrigerant circulation in experimental vacuum freeze dryer:
1. After the start-up, the refrigerant is compressed by the compressor from the low temperature and low pressure state to the high temperature and high pressure steam.
2. The high-temperature and high-pressure steam flows into the condenser and the secondary condenser, and the heat is taken away by the cooling medium through heat exchange, and the temperature is lowered, and the high-temperature and high-pressure vapor becomes a normal-temperature high-pressure liquid because of condensation.
3. The liquid refrigerant at normal temperature and high pressure flows through the expansion valve, because the throttling pressure of the expansion valve is lowered, so that the refrigerant becomes a liquid at normal temperature and low pressure.
4. After the liquid at normal temperature and low pressure enters the evaporator, the liquid refrigerant evaporates and becomes a low-pressure and low-temperature gas due to the pressure drop. When the refrigerant evaporates, it absorbs a large amount of heat of the compressed air, so that the temperature of the compressed air drops to the purpose of drying.
5. The low-temperature and low-pressure refrigerant vapor after evaporation flows back from the suction port of the compressor, is compressed and compressed, and is discharged to the next cycle.
 

Experimental Vacuum Freeze Dryer technology is mainly used in:
(1) freeze-drying of biological products with poor thermal stability, biochemical products, blood products, genetic engineering products, etc.;
(2) To maintain the structure and activity of biological tissues, the treatment of biological tissues such as cortex, bone, cornea and heart valve for surgery; (3) Coffee to maintain food color, aroma, taste and nutrients, and to quickly rehydrate Freeze-drying of seasonings, meat, seafood, fruits and vegetables;
(4) Application in microcapsule preparation, drug controlled release materials, etc. Processing of health products such as ginseng, royal jelly, and turtles and Chinese herbal preparations to maintain the invariability of fresh substances;
(5) Ultrafine powder functional materials such as: optical fibers, superconducting materials, microwave dielectric materials, magnetic powders, and treatment of catalysts capable of accelerating reaction engineering.

Related users (part)
Tsinghua University Peking University Huazhong Agricultural University
Beihang University, Chinese Academy of Medical Sciences, Nanjing University of Science and Technology
Beijing University of Science and Technology China Agricultural University South China University of Technology
Beijing Institute of Technology Nanjing University of Technology Xi'an University of Technology
Sichuan University Hunan University Qiqihar University
Tianjin University Lanzhou University Xiamen University
Tongji University Nanjing University Shenyang Pharmaceutical University
Zhejiang Sci-Tech University Zhongshan University Wuhan University
Zhejiang University Hunan University of Science and Technology Wuhan University of Technology
University of Science and Technology of China, Guangdong Ocean University Hubei Hong Pharmaceutical Co., Ltd.
Civil Aviation University of China Shenyang University of Technology Institute of Process Engineering, Chinese Academy of Sciences
Huazhong University of Science and Technology Beijing Orchard Research Institute Changsha Qixi New Material Technology Co., Ltd.
Beijing University of Chemical Technology Shandong Daguan Pharmaceutical Technology Co., Ltd. Dongguan City Original Ecological Biotechnology Co., Ltd.
Guizhou Institute of Biotechnology Sanming Hezhong Biotechnology Co., Ltd Harbin Children's Pharmaceutical Factory
National University of Defense Technology Changchun Hengchen Biotechnology Co., Ltd. Jinan Hengjian Pharmaceutical Technology Co., Ltd.
Institute of Chemistry, Chinese Academy of Sciences Dongguan Lujian Biotechnology Co., Ltd. Institute of Materia Medica, Chinese Academy of Medical Sciences
South China Sea Fisheries Research Institute Shanghai Institute of Materia Medica, Chinese Academy of Sciences Jiangsu Ouwei Pharmaceutical Co., Ltd.
Ministry of Agriculture Planning and Design Institute Shenzhen Jianyuan Pharmaceutical Technology Co., Ltd. Hangzhou Baicheng Pharmaceutical Technology Co., Ltd.
China Institute of Metrology Science Dongguan Sanwei Biotechnology Co., Ltd. Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences
Liaoning Wanjia Pharmaceutical Technology Co., Ltd. Suzhou Global Chromatography Co., Ltd. China Food and Drug Testing Institute Food Institute

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