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yibocommunal
Mar 25, 2022
In Welcome to the Forum
During the use of the magnetic drive pump, some users responded that the magnetic steel was demagnetized, resulting in the pump unable to operate normally. Therefore, it is considered to be the quality problem of the magnetic steel delivered by the company. However, after many after-sales analysis, we found that users had some problems in the early design or later use, resulting in demagnetization of magnetic steel. Therefore, in order to reduce the use cost of users and avoid unnecessary losses, let's talk about several major reasons for demagnetization of magnetic steel today. 1. The use temperature is unreasonable. The temperature of the material conveyed by the pump is too high, exceeding the allowable service temperature of the magnetic material. For example, for the pump with Nd-Fe-B magnetic steel, the service temperature should be less than 150 ℃. If the system temperature exceeds 150 ℃, the magnetic steel will be demagnetized soon. 2. Long time low lift operation. For example, if the flow at the rated point is 25 m3 / h and the head is 50 m, if it deviates from the rated point (for example, the head is only more than 10 meters), the return pressure inside the pump will drop, the circulation will be blocked, the eddy current belt of the metal isolation sleeve will not go, its temperature will rise sharply, and the magnetic steel will demagnetize. 3. Pipeline matching is unreasonable. For example, DN65 pipeline is required at the inlet. If the pipeline is less than 65mm, the flow will be in short supply, which will easily lead to poor internal circulation, heat is not easy to be taken away, and the system temperature exceeds the service temperature of magnetic steel. 4. The sliding bearing is worn and not replaced in time. If it is not replaced in time, there will be friction between the inner magnetic rotor and the inner wall of the isolation sleeve, resulting in the temperature rise of the isolation sleeve and demagnetization of the magnetic steel. 5. The magnetic pump runs idly. In this case, the temperature of the metal isolation sleeve and the inner magnetic rotor rises sharply, exceeding the service temperature of the magnetic steel, which will soon lead to demagnetization of the magnetic steel of the inner magnetic rotor. 6. The inlet and outlet pipelines of the pump are blocked. In this case, the magnetic pump idles, or the internal circulation of the pump is affected and the temperature rises; Moreover, the blockage of the outlet pipeline will also demagnetize the magnetic steel because the internal circulation of the pump cannot be carried out. If the pump inlet pipeline is equipped with a filter, the filter shall be cleaned regularly to ensure that the filtering area is within a reasonable range. 7. Abnormal jamming of rotor parts. The rotor component composed of internal magnet and impeller is stuck by mechanical impurities and cannot run, but the motor does not stop in time, which will lead to demagnetization of magnetic steel. 8. Cavitation. Cavitation of the pump due to various reasons will cause demagnetization of the magnetic steel. Does the molecular pumps can be treated with anti-corrosion?Like nickel plating?
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yibocommunal
Sep 02, 2021
In Welcome to the Forum
1. The oil loading window must be dirty and pickled. It is strictly prohibited to be exposed to the sun and stored in the open air. It should be stored in dark, dry and ventilated places to prevent the mixing of water and dirt. 2. When taking or loading oil, the drizzle around the barrel cover must be removed to prevent sundries from mixing into the oil and causing wear of the pump. 3. On the contrary, the vacuum pump oil of different brands and types shall not be mixed, and the old and new bamboo weaving shall not be mixed. 4. The vacuum pump shall be full capacity to prevent the extraction of solvent, steam and corrosive gas. It must be checked and changed frequently when it is used. 5. It is lenient to prevent vacuum oil from mixing with other smooth oil, and not to mix with light bamboo weaving. Whether it will be unnecessary to have vacuum performance. 6. When changing the oil, drain all the bamboo woven used in the pump body, pour in the new oil, slowly rotate the pump shaft, sweep the pump cavity, drain the residual oil, wash it repeatedly for several times, and replace it with new oil after cleaning. 7. When mineral oil is exchanged with ester oil or other decomposed oil, the pump shall be disassembled for bottom cleaning. All components must be immersed in ester oil to prevent purification. 8. The refueling appliance must be equipped with facilities and should not be a container containing other bamboo or solvents; Pump. 9. When overhauling the pump, be sure to clean and marinate all components of the pump with solvent or detergent, and dry the components. 10. If chemical gas and solvent are inhaled and vacuum is not necessary for pump oil purification, it must be cleaned and replaced. 11. During oil change: A. when the vacuum of pump oil falls and cannot meet the needs; b. When the pump oil becomes dark and brown, the oil should be changed. Do you know the role of dry screw vacuum pump in gasoline industry ?
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yibocommunal
Aug 31, 2021
In Welcome to the Forum
Vacuum distillation is a vacuum process often used in various chemical, pharmaceutical and petrochemical enterprises. At present, more and more enterprises fall in love with screw vacuum pumps in the process of selecting vacuum pumps for vacuum distillation, from chemical enterprises to various pharmaceutical enterprises. Recently, a well-known domestic pharmaceutical enterprise added another 18.5kw dry screw vacuum pump for vacuum distillation. With the improvement of social quality requirements for various industries, product defects will be amplified and the tolerance will be lower and lower. This is especially true for pharmaceutical products. Therefore, in vacuum distillation, in order to improve the distillation efficiency and improve the quality of distillation products, more and more pharmaceutical enterprises no longer pay attention to the pumping speed and vacuum degree, but also pay attention to the improvement of product quality by clean vacuum in the process of vacuum pump selection. The working range of dry screw vacuum pump is from atmospheric pressure to about 1pA extreme vacuum. It has a wide range of large pumping speed. A single pump with low vacuum can achieve high pumping speed. It has simple and reliable structure and convenient maintenance and operation. On the other hand, due to the inherent cleaning characteristics of screw vacuum pump, there is no need for other media to participate in the extraction process, and there is no need to worry about backflow polluting media. Moreover, it can be combined with roots to form a dry vacuum unit product with clean, high vacuum degree and large pumping speed. In food, fine chemicals, pharmaceutical semiconductors and other fields with strong demand for clean vacuum and various recycling fields, these characteristics can effectively improve the production efficiency of enterprises, greatly simplify the operation process and various supporting links of vacuum system, and improve the product quality. Therefore, they are favored by enterprises. Liquid Ring Vacuum Pumps Used in Paper Mill in Bengal
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yibocommunal
Aug 30, 2021
In Welcome to the Forum
Oil free screw vacuum pump has become one of the most widely used vacuum pumps in the market. It is welcomed by the public because of its characteristics of no oil fume, light weight and no pollution. However, many people do not know how to maintain it. The following small series will give you a popular science about the maintenance of oil-free screw vacuum pump. 1. There shall be sufficient and good ventilation conditions and ambient temperature below 40 ℃. 2. Clean the workplace without dust and dirt. 3. Water, oil and other liquids will not fall on the pump. 4. Not directly exposed to the sun. 5. There is enough surrounding space to facilitate the inspection, maintenance, assembly and disassembly of the pump. 6. The pump must be installed on a flat surface. 7. Install the pump on a hard concrete foundation. If there is no equipment, it can be installed on a steel frame or wooden frame. 8. It must be able to ensure that the pump does not vibrate due to the weak economic foundation. 9. The pipeline connected with the pump should not be too long or smaller than the pump inlet diameter, which will affect the pumping speed. At the same time, it is necessary to pay attention to safety and check the vacuum connection and whether the pipeline has air leakage. 10. When wiring, pay attention to the wiring requirements on the motor nameplate. Pay attention to the rotation direction of the motor for the three-phase electric pump, which shall be consistent with the direction of the arrow on the pump. The above is about the maintenance of oil-free screw vacuum pump. I believe you will understand it after reading it. You should pay attention to these situations in your daily work to avoid accidents. Vacuum Pump Heat Treatment Guide,Heat Treatment Equipment Liquid Ring Vacuum Pump
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