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Before we talk about the maintenance of stainless steel gear pump, we must first understand the structure of the stainless steel gear pump. Generally, it consists of four parts.
1, sliding bearing
Stainless steel gear pump sliding bearing materials are impregnated graphite, filled with polytetrafluoroethylene, engineering ceramics and so on.
Because engineering ceramics have good heat resistance, corrosion resistance and friction resistance, the sliding bearings of stainless steel gear pumps are mostly made of engineering ceramics. Since the engineering ceramics are very brittle and the expansion coefficient is small, the bearing clearance must not be too small to avoid a shaft accident. Since the sliding bearing of the stainless steel gear pump is lubricated by the medium to be conveyed, the bearing should be made of different materials according to different media and working conditions.
2, isolation sleeve
3. Control of cooling lubricant flow rate
When the stainless steel gear pump is running, it is necessary to flush and cool the annular gap between the inner magnetic rotor and the spacer and the friction pair of the sliding bearing with a small amount of liquid. The flow rate of the coolant is usually 2% to 3% of the pump design flow rate, and the annulus region between the inner magnetic rotor and the isolation sleeve generates high heat due to the eddy current. When the cooling lubricating fluid is insufficient or the flushing hole is not smooth and blocked, the medium temperature will be higher than the working temperature of the permanent magnet, and the inner magnetic rotor will gradually lose its magnetic force, causing the magnetic actuator to fail. When the medium is water or water-based liquid, the temperature rise of the annulus region can be maintained at 3-5 ° C. When the medium is hydrocarbon or oil, the temperature rise of the annulus region can be maintained at 5-8 ° C.
4, permanent magnet
Permanent magnets made of rare earth permanent magnets have a wide operating temperature range (-45 to 400 °C). The coercive force is high. The magnetic field has a good anisotropy. No demagnetization occurs when the same poles are close. It is a good source of magnetic field.
Then, when it comes to protection measures, when the driven parts of the magnetic actuator are operated under overload or the rotor is stuck, the main and driven parts of the magnetic actuator will automatically slip off the protection pump. At this time, the permanent magnet on the magnetic actuator will generate eddy loss and magnetic loss under the action of the alternating magnetic field of the active rotor, causing the temperature of the permanent magnet to rise and the magnetic actuator to slip off.
When the stainless steel gear pump uses a metal isolating sleeve, the spacer is in a sinusoidal alternating magnetic field. An eddy current is induced in a section perpendicular to the direction of the magnetic field lines and converted into heat.
The expression of eddy current is where Pe vortex, K-constant, n-pump rated speed, T magnetic drive torque, pressure in F spacer, D spacer inner diameter, resistivity of a material—material resistance Pull strength. When the pump is designed, T are given by the working conditions. The eddy current can only be reduced from F and D. The use of high-resistivity, high-strength non-metallic materials to make the isolation sleeve, the effect is very obvious in reducing the eddy current.
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