The structure and troubleshooting of the components of the magnetic pump. You have collected these pictures

As for the magnetic pump without dynamic seal and leakage, its principle and structural features are introduced below, and compared with the shield pump This paper introduces the structure of the components of the magnetic pump and the common troubleshooting in detail 1 Component structure analysis: the structure and components of the magnetic pump: the magnetic pump is composed of three parts: pump, magnetic actuator and motor, and the magnetic actuator is composed of outer magnetic cylinder, inner magnetic cylinder and non magnetic isolation sleeve The structure of magnetic pump is almost the same It mainly depends on who keeps the magnetic properties of the magnetic block for how long At present, there are many magnetic materials available for magnetic pump, such as alnico, ferrite and rare permanent magnetic material SmCo5 (1:5 for short), Sm (CO, Cu, Fe, Zr) 7.4 (2:17 for short), Nd-Fe-B, etc Among them, the rare earth permanent magnet material Zui is preferred The most powerful material of Zui is Nd-Fe-B, whose Zui large magnetic energy product is more than 28x104t · A / m, and its internal coercive force is more than 1120ka / m, which is very popular But its working temperature can't exceed 120 ℃, and it can choose the diamond permanent magnet material The magnetic energy product of Sm (CO, Cu, Fe, Zr) 7.4 is about 192x103t · A / m, and its working temperature can be as high as 300 ℃ The following are the detailed structures of different types of magnetic pump commonly seen on the market: 1 Shell part: it is composed of pump body, pump cover, etc., which bears all the working pressure of the pump; the hydraulic form of the pump body impeller conforms to api685 standard, which is the main characterization part of the hydraulic performance of the magnetic pump Its function is to force the liquid to rotate, so as to convert the mechanical energy of the prime mover into liquid energy 2 Rotor part: it is divided into the rotating parts installed on the pump shaft and the rotating parts installed on the drive shaft The pump shaft is an important part to carry the impeller, inner rotor and transmit torque The rotating parts installed on the pump shaft consist of impeller, bearing, thrust ring, inner magnetic rotor and the pump shaft itself to form the rotor part contacting with the medium The rotating parts installed on the drive shaft are composed of external magnetic rotor parts, rolling bearings, shaft sleeves of the drive shaft and the drive shaft itself to form the rotor part in contact with the air 3 Connecting part: a static connecting part composed of connecting frame, bearing box and other parts to connect and support Sliding bearing, shaft sleeve and thrust plate: they are supporting and positioning parts of pump rotor system parts 4 Transmission part: the pump and prime mover are connected by diaphragm type extended coupling parts During maintenance, only the middle diaphragm of the coupling needs to be removed to carry out maintenance of the magnetic pump 5 Inner and outer rotors: the inner and outer rotors are used together to form the magnetic transmission parts of the magnetic pump 6 Isolation sleeve: the isolation sleeve is a kind of * part that can completely realize no leakage of magnetic pump Because the pump shaft is in contact with the medium, the material requirements are corrosion resistance, high processing accuracy, high strength or through heat treatment to increase the strength of the material The magnetic coupling of the magnetic pump is integrated with the pump body, so it has compact structure, convenient maintenance, safety and energy saving The magnetic coupling of the pump can protect the drive motor from overload 2 The section of the magnetic pump shows the guardian magnetic drive pump??? CPXs magnetic drive pump??? Polychem M series fluoroplastic lined magnetic pump??? ERPn cantilever magnetic drive pump??? Pvml cantilever vertical magnetic drive pipeline pump??? 3 The advantage of troubleshooting the magnetic pump is that there is no leakage, which completely solves the problem of "running, emitting, dripping and leaking" But the disadvantages of the corresponding magnetic pump are: 1 High alignment requirements; 2 In the case of unclean inlet materials, it is easy to wear the inner magnetic cylinder and isolation sleeve; 3 High requirements for the production materials of the isolation sleeve of the magnetic pump 4 The magnetic pump is not allowed to run without materials 5 The efficiency of the magnetic pump is lower than that of the ordinary centrifugal pump 6 The price is relatively expensive 7 Limitation of use scope: the magnetic pump can not be used for a long time even if the mechanical parts are not damaged due to the weakening of the magnetic force due to the use of environmental temperature, motor temperature, Zui large working pressure, medium density and particle requirements in the working environment of the pump Therefore, the precautions for the use of the magnetic pump are as follows: (1) after installation, rotate the coupling by hand to check whether there is any friction (2) In order to prevent sundries from entering the pump, a filter is set at the inlet of the pump, and the filtering area is 3-4 times larger than the cross-sectional area of the pipeline (3) No idling (4) A check valve shall be installed on the outlet pipeline of the pump with high lift to prevent the damage of water hammer in case of sudden shutdown (5) Start up procedure: before starting up, open the inlet valve to fill the pump with the liquid to be delivered; close the outlet valve; start the electric hoist to check whether the pump direction is correct; after the pump is started, the outlet valve shall be opened slowly, and after the pump reaches the normal operation state, adjust the outlet valve to the required opening Test run for 5-10min, if there is no abnormality, it can be put into operation Shutdown procedure: close the outlet valve; cut off the power supply; close the inlet When the pump is shut down for a long time, clean the flow passage in the pump and cut off the power supply CQB magnetic pump maintenance precautions (1) pump shaft broken The pump shaft of CQB type magnetic pump is made of 99% alumina ceramic The main reason for the fracture of the pump shaft is that the shaft is broken due to the pump running empty and the bearing dry grinding When the pump is disassembled for inspection, it can be seen that the bearing is worn seriously The main way to prevent the pump from breaking is to avoid the pump from idling (2) The bearing is damaged The bearing of CQB magnetic pump is made of high-density carbon If the pump is cut off or there are impurities in the pump, the bearing will be damaged If the coaxiality between the inner and outer magnetic rotors of the cylindrical coupling is not guaranteed, the bearing life will be directly affected (3) The pump can't pump out liquid The failure of pump to pump liquid is easy to occur in Zui, and there are many reasons First of all, check whether there is any air leakage in the suction pipe of the pump, whether the air in the suction pipe is discharged, whether the liquid filled in the pump is sufficient, whether there is any blockage in the suction pipe, check whether the pump reverses (especially after changing the motor or after the maintenance of the power supply line), and whether the suction height of the pump is too high If the above inspection still cannot be solved, the pump can be disassembled for inspection to see whether the pump shaft is broken, whether the dynamic and static rings of the pump are in good condition, and whether the whole rotor can move a little axially If the axial movement is difficult, check whether the carbon bearing is too tightly combined with the pump shaft It is worth noting that the pump has been repaired several times without finding out the problem It is necessary to pay attention to whether the magnetic coupling works normally Bearing, inner magnetic rotor and spacer will generate heat in operation, which will increase the working temperature, on the one hand, reduce the transmitted power, on the other hand, it will cause great trouble for the pump that transports easily vaporized liquid The transmission power of the magnetic steel decreases continuously with the increase of temperature Generally, the decrease of the transmission capacity is reversible below the working limit temperature of the magnetic steel, but irreversible above the limit temperature, that is, the lost transmission capacity can no longer be restored after the cooling of the magnetic steel Under special circumstances, when the magnetic coupling slips (out of step), the eddy current heat in the spacer will increase sharply, and the temperature will rise sharply If not handled in time, it will cause the demagnetization of the magnetic steel and the failure of the magnetic coupling Therefore, the magnetic pump should be designed with a reliable cooling system For the medium that is not easy to vaporize, the cooling circulation system generally draws liquid flow from the impeller outlet or pump outlet, and returns to the suction population through the bearing and magnetic drive part For the medium that is easy to vaporize, the heat exchanger shall be added or the liquid flow shall be led to the storage tank outside the pump to avoid the heat returning to the suction population For the medium with solid impurities or ferromagnetic impurities, filtration shall be considered For the medium with high temperature, cooling shall be considered To ensure that the magnetic coupling does not exceed the working limit temperature When considering whether the rotation speed is enough, first check whether the rotation speed of the motor itself is normal, which can be measured by tachometer When the rotation speed of the motor is normal, consider whether the magnetic coupling will slip (4) Insufficient lift The reasons for this failure are: there is air in the conveying medium, the impeller is damaged, the rotating speed is not enough, the proportion of conveying liquid is too large, and the flow is too large (5) Insufficient flow The main causes of insufficient flow are: impeller damage, insufficient rotation speed, too high head, debris blockage in the pipe, etc