Time：2021/10/12 19:41:11 Category：TECHNICAL ARTICLE Source： Click：
The high temperature magnetic drive pump is composed of three parts: self-priming pump, magnetic drive and motor. The key component of the magnetic drive consists of an outer magnetic rotor, an inner magnetic rotor and a non-magnetic isolation sleeve.
Permanent magnets made of materials have a wide operating temperature range (-45-400°C), high coercivity, and good anisotropy in the direction of the magnetic field. Demagnetization will not occur when the same poles are close. Very good source of magnetic field.
When the metal isolating sleeve is used, the isolating sleeve is in a sinusoidal alternating magnetic field, and eddy current is induced in the cross section perpendicular to the direction of the magnetic force line and converted into heat.
Analysis of daily working failure of high temperature magnetic drive pump
1. Insufficient head. The reasons for this failure are: there is air in the conveying medium, the impeller is damaged, the speed is not enough, the specific gravity of the conveying liquid is too large, and the flow rate is too large.
2. The shaft of the high temperature magnetic drive pump is broken. The material used for the pump shaft of the CQB high temperature magnetic pump is 99% alumina porcelain. The main reason for the pump shaft to break is that the shaft is twisted due to the dry running of the pump and the dry grinding of the bearings. When the pump is disassembled and inspected, it can be seen that the bearings have been severely worn. The main way to prevent the pump from breaking is to avoid the dry running of the pump.
3. Insufficient flow. The main reasons for insufficient flow are: impeller damage, insufficient speed, excessive lift, and clogging of debris in the pipe.
4. The high temperature magnetic drive pump cannot pump out liquid. The failure of the high temperature magnetic drive pump to pump out liquid is the most likely failure of the pump, and there are many reasons for it. Firstly, check whether the suction pipe of the pump is leaking, check whether the air in the suction pipe is discharged, whether the amount of liquid filled in the high-temperature magnetic drive pump is sufficient, whether there is debris in the suction pipe, and check whether the pump is blocked. Reverse rotation (especially after the motor is changed or the power supply line is overhauled), you should also pay attention to whether the suction height of the pump is too high. If you still can't solve the problem through the above inspections, you can disassemble the pump and check to see if the pump shaft is broken. You should also check if the moving and static rings of the pump are intact, and whether the entire rotor can move a little bit axially. If the axial movement is difficult, check whether the carbon bearing is too tightly combined with the pump shaft.
Knowledge contributor: Shanghai Lingnai Special Magnetic Pump Co., Ltd.