Structural characteristics of Magnetic centrifugal pump

Magnetic centrifugal pump is a high-tech product that applies the working principle of permanent magnet coupling to centrifugal pump. It has the characteristics of reasonable design, advanced technology, full sealing, no leakage and corrosion resistance. Magnetic centrifugal pump can be widely used in chemical industry, acid making, alkali making, smelting, rare earth, pesticide, dye, medicine, papermaking, electroplating, acid pickling, radio, foil forming, petroleum, food, film photography and printing, scientific research institutions The transportation and pressurization of acid, alkali, oil rare and precious liquid, venom and volatile liquid, especially leaky, flammable and explosive liquid, pumped by units such as national defense industry.

Below is a list of contents

1. Permanent magnet of Magnetic centrifugal pump

2. Isolation sleeve of Magnetic centrifugal pump

3. Control of cooling and lubricating fluid flow of Magnetic centrifugal pump

4. Sliding bearing of Magnetic centrifugal pump

5. protective measures

Permanent magnet of Magnetic centrifugal pump

The permanent magnet made of rare earth permanent magnet material has a wide working temperature range (- 45-400 ℃), high coercivity, good anisotropy in the direction of magnetic field, and no demagnetization when it is close to the same pole. It is a good magnetic field source.

Isolation sleeve of Magnetic centrifugal pump

When the metal isolation sleeve is used, the isolation sleeve is in a sinusoidal alternating magnetic field, which induces eddy current on the section perpendicular to the direction of the magnetic line of force and converts it into heat. The expression of eddy current is: where PE-eddy current; K-constant; N-rated speed of pump; T-magnetic transmission torque; F-pressure in the spacer; D-inner diameter of spacer. When the pump is designed, N and T are given under working conditions. To reduce eddy current, we can only consider the aspects of F and D. Selecting non-metallic materials with high resistivity and high strength to make isolation sleeve have obvious effect in reducing eddy current.

Control of cooling and lubricating fluid flow of Magnetic centrifugal pump

The coolant flow is usually 2% - 3% of the design flow of the pump. The annular gap area between the inner magnetic rotor and the isolation sleeve generates high heat due to eddy current. When the cooling and lubricating fluid is insufficient or the flushing hole is blocked, the medium temperature will be higher than the working temperature of the permanent magnet, gradually losing the magnetism of the internal magnetic rotor and invalidating the magnetic driver. When the medium is water or water-based liquid, the temperature rise in the annulus area can be maintained at 3-5 ℃; When the medium is hydrocarbon or oil, the temperature rise in the annulus area can be maintained at 5-8 ℃.

Sliding bearing of Magnetic centrifugal pump

The materials of magnetic pump sliding bearing include impregnated graphite, filled polytetrafluoroethylene, engineering ceramics, etc. Because engineering ceramics are very brittle and have small expansion coefficient, the bearing clearance shall not be too small to avoid shaft holding accidents. Since the sliding bearing of the magnetic pump is lubricated with the transmitted medium, different materials should be selected to make the bearing according to different media and service conditions.

Protective measures

When the driven parts of the magnetic actuator operate under overload or the rotor is stuck, the driving and driven parts of the magnetic actuator will slip off automatically to protect the pump.

Taicang magnetic pump Co., Ltd. was born in 1979. It cooperated with Shanghai Chemical Design Institute to form a unique core research project with magnetic drive pump, and achieved great success. It has become the first company in China to comprehensively design and produce magnetic drive pump. Today, Taicang magnetic pump Co., Ltd. has become a leading manufacturer of magnetic drive pumps in China, with many patents and 12 utility model patents.