Magnetic pump, magnetic pump working principle, magnetic pump belongs to centrifugal pump, magnetic pump model

Magnetic pump, is a more common industrial products, widely used in industrial production in daily life. Many people do not distinguish between magnetic pump and centrifugal pump difference, that the magnetic pump is a centrifugal pump, which is a misunderstanding. Today, Xiaobian from the following aspects to illustrate what kind of tool is a magnetic pump. Magnetic pump, magnetic pump working principle, magnetic pump is a centrifugal pump, a magnetic pump model, the definition of magnetic pump Magnetic drive pump (hereinafter referred to as magnetic pump) is the permanent magnetic coupling principle of work applied to centrifugal pump new products, well-designed , Advanced technology, with a fully sealed, leak-proof, corrosion-resistant and so on. Magnetic pump by the pump, magnetic actuator, the motor consists of three parts. The key components of the magnetic actuator consists of an outer magnetic rotor, an inner magnetic rotor and a non-magnetic isolation cover. When the motor drives the outer magnet rotor to rotate, the magnetic field can penetrate the air gap and the non-magnetic substance to drive the inner magnet rotor connected with the impeller to rotate synchronously to realize the powerless contact transmission and transform the dynamic seal into the static seal. As the pump shaft, the inner rotor is completely closed by the pump body and the isolation sleeve, thus completely solving the problems of running, running, dripping and leakage, and eliminating the leakage of flammable, explosive, toxic and harmful media through the pump seal in the refining and chemical industry The security risks. Magnetic pump is a branch of the field of pumps, magnetic pump is a permanent magnet coupling principle of work applied to centrifugal pump new products. Magnetic pumps are mainly used in computer cooling systems, solar fountains, desktop fountains, handicrafts, coffee machines, drinking fountains, soilless cultivation, washing teeth, water heaters pressure, hot water circulation, swimming pool water cycle filter, Jacuzzi, car cooling system, oil, humidifiers, air conditioners, medical equipment, cooling systems, bathroom products. Second, the principle of magnetic pump Magnetic drive is the use of magnets to attract ferromagnetic material and the magnetic or magnetic field between the magnetic properties of non-ferromagnetic material does not affect or seldom affect the size of the magnetic force, it can be contactlessly through Non-magnetic conductor (isolation sleeve) for power transmission. Magnetic drive can be divided into synchronous or asynchronous design. Most magnetic pumps use a synchronous design. Motor through the external coupling and the outer magnet together, the impeller and the inner magnet together. Between the outer magnet and the inner magnet with a fully sealed isolation sleeve, the inner and outer magnet completely separated so that the inner magnet in the medium, the motor shaft through the magnet pole between the suction force directly drives the impeller synchronization Turn. Asynchronous design magnetic drive, also known as Torque Loop magnetic drive. Replace the inner magnet with a squirrel-cage torque ring, which is attracted at a slightly lower speed by the outer magnet. Because there is no magnet, so the temperature is higher than the synchronous drive magnetic drive. Third, the magnetic pump model 1.CQ-type magnetic drive pump Caliber range: 14-100 / 10-80 (mm) Flow range: 1.2-60 (m3 / h) Lift range: 5-50 (m) 2.CQB type stainless steel Magnetic pump diameter range: 32-100 / 20-80 (mm) Flow range: 3.2-100 (m3 / h) Head range: 20-80 (m) 3.CQF plastic magnetic drive pump caliber range: 10-65 / 8-50 (mm) Flow Range: 0.9-25 (m3 / h) Head Range: 3-32 (m) 4.CQB-F type fluorine plastic magnetic pump Diameter range: 15-100 / 15-80 (mm) Flow Range: 1.8-100 (m3 / h) Head range: 8-32 (m) 5.CQB-G series of high temperature magnetic pump Diameter range: 32-100 / 20-65 (mm) Flow range: h) Head range: 7.5-86 (m) 6.CQGD type pipe-type magnetic pump Diameter range: 25-100 (mm) Flow range: 1.6-100 (m3 / h) Lift range: 12.5-80 (m) MP Series Miniature Magnetic Drive Circulation Pump Caliber Range: 14-26 / 14-26 (mm) Flow Range: 4.5-300 (L / min) Head Range: 0.8-20.5 (m) 8.ZCQ self-priming magnetic pump caliber Range: 20-80 / 12-65 (mm) Flow range: 3-50 (m3 / h) Head range: 12-50 (m) 9.CQG-type high temperature stainless steel magnetic pump Diameter range: 20-100 / 15- 80 (mm) Flow range: 50-1650 (L / min) Head range: 12-50 (m) 10.CW-type magnetic drive Vortex pump Diameter range: 15-65 (mm) Flow range: 0.36-14.4 (m3 / h) Head range: 30-210 (m) Fourth, the magnetic pump applications Can be used in computer water cooling systems, solar fountains, desktop fountains, handicrafts , Coffee machine, water dispenser, tea maker, pourer, soilless culture, shower, bidet, dental scrubber, water heater pressurization, plumbing mattress, hot water circulation, swimming pool water circulation filtration, Basin, surf jacuzzi, car cooling system, oil cooler, humidifier, air conditioner, washing machine, medical equipment, cooling system, sanitary products. Fifth, the advantages and disadvantages of magnetic pumps (A) Advantages Magnetically driven centrifugal pump advantages include no leakage, internal and external rotor can have a larger interval, the use of non-metallic isolation sleeve, the thickness of not more than 8mm, the thickness of the metal isolation sleeve Not greater than 5mm, the wall thickness of the isolation sleeve is larger, the possibility of the isolation sleeve being worn through is smaller, the gap between the isolation sleeve and the inner and outer magnetic rotors is also larger, the magnetic centrifugal pump operates reliably, the inner magnetic rotor With the isolation sleeve wear the possibility of isolation sets, easy to disassemble, replaceable in the field, easy maintenance, can be applied to SIC bearings, good wear resistance, long service life, the pump speed is not limited by the motor. In addition to the magnetic centrifugal pump also has the following advantages: 1, magnetic centrifugal pump because the drive shaft does not need to penetrate the pump housing, but the use of magnetic field through the magnetic field and isolation sets of thin-walled transmission torque driven Magnet rotor, thus fundamentally eliminate the shaft seal leakage channel, to achieve complete sealing. 2, magnetic drive pump power overload overload protection. 3, magnetic pump magnetic materials and magnetic circuit design have higher requirements, the remaining part of the technical requirements are not high. 4, magnetic drive pump maintenance and repair workload is small. (B) the shortcomings 1, the efficiency of magnetic centrifugal pumps lower than ordinary centrifugal pumps, not in the flow of low rated flow of 30% of the operation, but more taboo idling. 2, magnetic centrifugal pump As the isolation sleeve material wear resistance is generally poor, so the magnetic pump is generally used to transport medium without solid particles and prohibited magnetic particulate material into the pump. 3, the general structure of the magnetic centrifugal pump, allowing the delivery of liquids containing less than 0.15mm in diameter (100 mesh), the mass fraction of not more than 5% of the solid particles (more than the need to add ancillary systems). 4, the pump and the motor shaft coupling, the coupling on the center line installation requires high accuracy, right in the wrong, will lead to the import bearing damage and prevention of single side leakage isolation sleeve wear. 5, magnetic centrifugal pump magnetic drive, a synchronous drive and asynchronous transmission in two ways, synchronous drive, both inside and outside the magnetic rotor is equipped with a permanent magnet, so the temperature of liquid transport must be lower than the maximum allowable temperature of the permanent magnet. Must leave a certain amount of surplus, although the cobalt and samarium permanent magnet can reach 350 degrees Celsius, but the actual use of temperature is generally not more than 260 degrees Celsius, no side heat may cause permanent magnet demagnetization, special structure of the magnetic pump up to 450 degrees Celsius, 6, the magnetic centrifugal pump on the isolation sleeve material and manufacturing processes require higher, if the material is not properly selected or manufacturing quality is poor, the isolation sleeve can not afford to wear and tear caused by wear and tear of the rotor inside and outside, but broken, the media will be transported Spill, resulting in equipment failure, affecting the normal operation of the device. 7, magnetic centrifugal pump conveying medium temperature exceeds the provisions of the need to provide external cooling, such as the installation of insulation chamber, the pump cavity injection pressure is higher than the sealing pressure of coolant, cooling the inner rotor and bearings, but also can be used with a sandwich Of the isolation sleeve, the coolant flow into the mezzanine, or set the cooling jacket cooling jacket and pump, single structure is complex, the cost is higher. Sixth, the magnetic pump common fault (1) pump shaft broken magnetic pump shaft material is 99% alumina ceramic. (2) magnetic pump bearing damage. Magnetic pump bearings are made of high-density carbon material, in case of pump water or pump impurities, it will cause the bearing damage. Cylindrical shaft coupling inside and outside the rotor between the coaxial requirements if not guaranteed, will also directly affect the bearing life. (3) magnetic pump can not play the liquid magnetic pump can not hit the liquid pump is the most prone to failure, the reasons for more. First of all, check the suction pipe of the pump for any leaks, check whether the air in the suction pipe is drained, whether the amount of liquid poured in the pump is enough, if there is any clogged debris in the suction pipe, check if the pump is reversed Especially after changing the motor or overhauling the power supply line), you should also pay attention to whether the pump suction height is too high. If you still can not solve the above inspection, you can check the magnetic pump apart. It is noteworthy that the pump repaired a few times can not find the problem, should pay attention to the work of magnetic coupling is normal (4) lack of head lift. The reasons for this failure are: transmission medium air, impeller damage, speed is not enough, the proportion of liquid transport is too large, the flow is too large. (5) insufficient magnetic flux pump. The main reasons for the lack of flow are: impeller damage, speed is not enough, the lift is too high, the tube is clogged with debris and so on. Seven, the use of magnetic pump maintenance 1. Start-up and running a clean equipment around the impact of equipment and operator safety debris. b before driving the pump should be filled with liquid to be transported (such as the pump is in the case of suction), open the inlet valve, close the outlet gate valve, connect the power. c Turn on the power and check that the steering of the pump is correct. d Unit trial run 3-6 minutes, if no abnormalities can be put into operation. f When driving for the first time after long-term shutdown or overhaul, remove the fan cover of the motor and manually turn it on. Check whether the rotation of the magnetic pump is flexible and install the fan cover after confirming there is no problem. 2. Normal shutdown should be the first gate valve closed, and then cut off the power. 3. Emergency stop immediately stop the motor, and then close the outlet valve and inlet valve. 4. Repair and maintenance Regular inspection of pumps and motors, replacement of vulnerable parts. Long-term shutdown when not in use, should clean the pump flow channel and cut off the power. No air operations. 5. Precautions during operation a Note that the suction side of the filter before and after the pressure difference, the pressure difference increases, said the filter blockage of foreign matter, to stop the pump operation, in order to clean the strainer. b Emissions, discharge pressure is in line with the provisions of; c with or without abnormal sound and vibration, if abnormal sound or vibration, the general situation of cavitation or bearing excessive wear. e pump cavitation: open the pump outlet valve, when the flow reaches a certain amount, a sudden sound and vibration, then continue to open the valve, if the flow does not increase, indicating cavitation. Cavitation should be carried out when the exhaust operation. Caution: The magnetic pump must not operate under cavitation. If it continues to operate in this condition, it will cause early wear of the bearing. f Whether the current value of the motor exceeds the rated current. g parts of the pump temperature abnormalities without abnormal conditions. h Nitrogen pressure regulator system pressure should be maintained within the specified range. To sum up: magnetic pump in our production and life play a decisive role, and only properly use it, regular maintenance and timely maintenance, to make it better for our service. (Editor: Huang Nengwen QQ :)