CQ magnetic drive pump, referred to as magnetic pump, a contact-free torque transmission to thereby replace the static seal dynamic seal, so that no leakage magnetic pump reaches a centrifugal pump by a magnetic actuator (magnetic coupling). Magnetic pump structural features: magnetic pump by the pump, magnetic coupling and drive motor consists of three parts. The left end of the shaft is equipped with impeller, the right end is equipped with an inner rotor, the shaft supported by the sliding bearing. The brackets connect the pump to the motor and ensure the position accuracy of the inner and outer magnetostric rotors. When the motor drives the outer magnetic rotor to rotate, the magnetic field drives the inner magnetic rotor to rotate synchronously by the air gap and the separation sleeve, so as to drive the impeller to rotate. 1, the pump generally use corrosion-resistant, high-strength engineering plastics, corundum ceramics, stainless steel, etc. as a production material, has good corrosion resistance, and can be transported medium from pollution. Such as CQB series of magnetic pump contact is transported liquid part is made of chemical resistant fluorine plastic alloy. Fluoroplastics alloys consist of a mixture of ultra-high molecular weight, poly-FEPs thermoplastically-processed with one or more other plastics, which can be added to fillers. Such as by the ultra-high molecular weight poly FEP and PTFE plastic alloy, the former accounted for the weight ratio of 0.1% to 99.9%, which accounted for the weight ratio of 99.9% to 0.1%, with a dry powder co-grinding or wet Method of co-grinding method of manufacturing. Using hot or cold pressure sintering and other methods into a variety of products, to overcome the cold PTFE flow and deformation defects, can extend the service life. Magnetic pump bearings are immersed in the transport medium, and transport medium lubrication and cooling. More commonly used bearings in China are mostly graphite and reinforced plastic. In particular graphite impregnated graphite having good self-lubricating property, heat resistance, low friction coefficient, wide range of applications, but more brittle graphite, low strength, and bending of the shaft is very sensitive to partial overload, special attention should be. Steel as the matrix, the porous bronze as the middle layer, the plastic surface layer of the three-layer composite bearing high compressive strength, low friction coefficient, dimensional stability, noise reduction shock absorber, has been applied in recent years. 2, magnetic coupling Magnetic coupling is to achieve non-contact torque transmission so as to achieve a complete leak-free key components. There are generally disc-shaped and cylindrical two forms. Since the disc-shaped coupling consists of two ring-shaped magnets facing each other and a spacer therein, an axial force exists between the two ring-shaped magnets, and in particular, when the power is large, the axial force is large and it is very difficult to overcome it. Generally less used. The cylindrical coupling comprises an outer magnet rotor, an inner magnet rotor and a spacer (separate) sleeve. The outer magnet rotor is connected with the motor and is in the atmosphere. The inner magnet rotor is integrated with the pump shaft. The whole rotor is Contained in the pump housing and the spacer and immersed in the transport medium, the spacer between the inner and outer rotor and fixed to the pump housing, the magnetic pump housing and the isolation sleeve to form a communication within the completely sealed chamber. Magnetic steel in the outer cylindrical surface of the outer rotor and the inner cylindrical surface of the rotor closely arranged in the circumferential direction, forming a "combination of push-pull magnetic circuit." At present, there are many magnetic materials available for the magnetic pump, commonly used are SmCo5 (abbreviated as 1: 5), Sm (Co, Cu, Fe, Zr) 7.4 (referred to as AlNiCo, ferrite and rare- 2:17), Nd-Fe-B and the like. Wherein the rare earth permanent magnet material is most preferred, is the most powerful hinge ferroboron Nd-Fe-B, the maximum energy product as high as 28 x 104T · A / m or more, the coercive force exceeds the police 1120kA / m, acclaimed . However, its working temperature can not exceed 120 ℃ under the condition of high temperature. The energy product of Sm (Co, Cu, Fe, Zr) 7.4 is about 192 × 103T · A / m and its operating temperature can reach as high as 300 ℃ Cylindrical couplings should pay great attention to the position between the inner and outer magnetic rotors in the process of design, machining and assembly, otherwise radial force will be generated. This radial force not only affects torque transmission, but also has a direct bearing on the life of the bearing, serious, will make the magnetic coupling can not work. The key to solve this radial force is to ensure that the magnetic rotors inside and outside should have the necessary coaxiality. In addition, the magnetic pump assembly and disassembly, there should be dedicated tooling and tools to protect personnel and parts from knocking bruises. In the magnetic pump work, the spacer in an alternating magnetic field, will induce eddy currents. This eddy current, on the one hand, consumes shaft power and reduces transmission efficiency. On the other hand, it is transformed into heat, to the medium and to the temperature of the circulating medium. Therefore, the design of the spacer must pay attention to the material selection and geometry size, especially for conveying easily vaporized liquid. After the parameters and requirements of the pump are given, the main factor for the loss of power p of the spacer can be approximated as Pαd2 / p · σ, where d is the spacer diameter and p is the resistivity of the material. Allowable stress for the material. Visible, the main way to reduce eddy current loss is to use high resistivity, high strength materials, and minimize the spacer diameter. There are two general categories of materials that are commonly used to make glands: metallic and non-metallic materials. Metal materials have high mechanical strength, wall thickness can be controlled at the thinnest, in order to reduce the gap between the inner and outer magnetic rotor, increasing transmission efficiency, while reducing the eddy current loss generated within the spacer. China generally use 1Cr18Ni9Ti and alloy. Non-metallic material has good corrosion resistance, no eddy current loss, can improve the transmission efficiency, but are restricted by the pressure and temperature of the transport medium and limits the application of the commonly used domestic polytetrafluoroethylene.
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