Plant extracts are based on plants as raw materials. According to the needs of the use of the final product extracted, through a physical and chemical extraction and separation process, one or more effective ingredients in the plant are obtained and concentrated, without changing the effective ingredients. The product formed by the structure. Plant extract,milk thistle extract,Quercetin,mushroom extract,rutin PYSON Co. ,Ltd. , https://www.pysonbio.com
1. According to the content of active ingredients, it can be divided into three types: effective monomer extract, standard extract and ratio extract;
2. Divided into glycosides, acids, polyphenols, polysaccharides, terpenes, flavonoids, alkaloids, etc. according to ingredients;
3. According to the product form, it can be divided into vegetable oil, extract, powder, lens, etc.
4. According to the purpose, plant extracts can be divided into natural pigment products, traditional Chinese medicine extract products, extract products and concentrated products.
There are several classifications of some of the best-selling plant extracts in the world. For example, Rhodiola, Ginkgo biloba, Ginseng extracts are used in the field of brain strengthening, nourishment, and prevention and treatment of Alzheimer's; polypeptide extracts of green tea, Citrus aurantium, apple, and bitter gourd Used in weight loss, lowering blood sugar and preventing diabetes; Paclitaxel, tea polyphenols, theanine, bioflavonoids, such as lycopene, anthocyanins, etc. are used in natural anti-cancer fields; licorice, garlic, astragalus, soybean extract Used in the field of human immune system.
How to repair? What are the reasons why the cold storage is not cooled or the cooling effect is not good?
How to repair? What are the reasons why the cold storage is not cooled or the cooling effect is not good?
The cooling capacity can not meet the warehouse load requirements (compressor efficiency is low)
First, the refrigerant charge is insufficient, and there are two main reasons for the lack of refrigerant circulation. At this point, it is only necessary to fill in a sufficient amount of refrigerant. Another reason is that the system refrigerant leaks more. To catch up with this situation, first find the leak point, focus on the connection of each pipe and valve, and find the leak. After the parts are repaired, a sufficient amount of refrigerant is charged.
Lack of refrigeration capacity (insufficient refrigerant in the system)
Insufficient refrigerant charge in the system directly affects the flow of refrigerant into the evaporator. When the expansion valve is opened too much, the expansion valve is improperly adjusted or blocked. When the refrigerant flow rate is too large, the evaporation pressure and evaporation temperature also increase, and the warehouse temperature drop rate will slow down. At the same time, when the expansion valve is opened too small or blocked, the refrigerant flow rate also decreases, and the system cooling capacity also follows. As the reduction, the temperature of the warehouse temperature will also slow down. It is generally possible to determine whether the refrigerant flow rate of the expansion valve is appropriate by observing the evaporation pressure, the evaporation temperature, and the frosting of the suction pipe. Plugging of the expansion valve is an important factor affecting the flow rate of the refrigerant, and the main cause of the blockage of the expansion valve is ice blockage and dirty blockage. Ice blockage is caused by the poor drying effect of the dryer. The refrigerant contains moisture. When flowing through the expansion valve, the temperature drops below 0 °C, and the moisture in the refrigerant forms ice and blocks the throttle hole; dirty blockage is because The inlet of the expansion valve filter contains a lot of dirt, and the refrigerant is smooth and fluent, forming a blockage.
The refrigerant flow rate is too large or too small (the expansion valve is improperly adjusted or blocked)
The heat transfer coefficient will be reduced, and more refrigerant oil is attached to the inside and outside of the evaporator heat transfer tube. Similarly, if there is more air in the heat transfer tube, the heat exchange area of ​​the evaporator is reduced, the heat transfer efficiency is also significantly reduced, and the temperature drop rate of the warehouse is slowed down. Therefore, in daily operation and maintenance, attention should be paid to timely clearing the external oil in the evaporator heat transfer tube and discharging the air in the evaporator to improve the heat transfer efficiency of the evaporator. How to repair? What are the reasons why the cold storage is not cooled or the cooling effect is not good?
Reduced heat transfer (more air or refrigeration oil in the evaporator)
This is mainly because the outer frost layer of the evaporator is too thick or excessively dusty because the external temperature of the cold storage evaporator is mostly lower than 0 ° C, and another important reason for the slow decline of the storage temperature is that the heat transfer efficiency of the evaporator is low. The humidity in the warehouse is relatively high, and the moisture in the air is easy to frost on the surface of the evaporator, and even freezes, which affects the heat transfer effect of the evaporator. In order to prevent the outer frost layer of the evaporator from being too thick, it needs to be defrosted on schedule. Here are two simpler defrosting methods: 1 stop defrosting. That is, the compressor is stopped, the warehouse door is opened, and the temperature of the warehouse is raised. After the frost layer is automatically melted, the compressor is restarted. 2 flushing cream. After the goods in the warehouse are carried out, the surface of the evaporator tube is directly washed with tap water having a relatively high temperature to dissolve or fall off the frost layer. In addition to the excessive frosting, the heat transfer effect of the evaporator is not good. The appearance of the evaporator is too thick due to temporary uncleaning, and the heat transfer efficiency is also significantly reduced.
The heat transfer effect is reduced (the evaporator surface is too thick or excessively dusty)
The heat insulation and insulation effects are poor, and the heat insulation performance is poor because the insulation layer of the pipeline and the warehouse insulation wall is not thick enough. Mainly due to the improper selection of the thickness of the insulation layer during design or the poor quality of the insulation materials during construction. During the construction process, the insulation moisture-proof function of the insulation data may be destroyed, resulting in the insulation layer being damp, deformed or even smashed. As the capacity declines, the library's cooling capacity loss increases, and the storage temperature drops significantly. Another important reason for the large loss of cold is that the warehouse sealing function is poor, and more hot air invades the warehouse from the leak. Generally, if the condensation occurs in the seal of the warehouse door or the seal of the cold storage wall, it means that the seal is not tight. In addition, frequent switching of warehouse doors or more people into the warehouse together will also increase the cold storage loss of the warehouse. The library door should be prevented from opening as much as possible to prevent large amounts of hot air from entering the warehouse. Of course, when the warehouse is frequently stocked or the quantity of goods is too large, the heat load increases sharply, and it takes a long time to cool down to the specified temperature. How to repair? What are the reasons why the cold storage is not cooled or the cooling effect is not good?
Result in large loss of cooling capacity (cold storage due to poor insulation or sealing function)
Parts such as cylinder liners and piston rings are severely worn, and the compressor is temporarily operated. When the clearance is increased, the sealing function will decrease accordingly, and the gas transmission coefficient of the compressor will also decrease, and the cooling capacity will decrease. When the cooling capacity is less than the heat load of the warehouse, it will cause the warehouse temperature to drop slowly. The refrigeration capacity of the compressor can be roughly determined by observing the suction and discharge pressures of the compressor. If the refrigeration capacity of the compressor drops, the common method is to replace the cylinder liner and piston ring of the compressor. If it still cannot be effective after replacement, other factors should be considered, and even the disassemble inspection should be taken to eliminate the failure factor.