Practical Application of Leakage Pump Technology in Chemical Production

1. The main types of leak-free pumps and leak-free pump structure, including shielding pumps, magnetic pumps, positive displacement diaphragm pumps, electromagnetic pumps and so on. According to engineering practice, this article describes the non-leakage pump shielding pump and magnetic pump, foreign literature often referred to as the shaft seal pump. 1.1 shield pump leak-free pump, shield pump used widely. The shield pump is mainly composed of a pump body, an impeller, a stator, a rotor, front and rear bearings, and a thrust plate. The motor and the pump are integrated. The shield and the rotor are separated by a shielding sleeve made of non-magnetic thin-walled material. The rotor is supported by the front and rear bearings Immersed in the transport medium. After the stator windings are energized, the electromagnetic energy can be transmitted through the shielding sleeve to drive the rotor to rotate, which in turn drives the impeller to transport the medium. 1.2 Magnetic Pump Magnetic pump is installed on the pump shaft and the motor shaft, the magnetic force generated by the rotor, the motor torque is passed to the pump shaft, and then drive the impeller to send medium. When the motor rotates, the outer magnet rotor attracts each other through the isolation sleeve and the inner magnet rotor to drive the pump shaft and the impeller to rotate. The same number of magnet blocks inside and outside the rotor, forming a one-to-one relationship between the poles, the two synchronous rotation. As the isolation sleeve will be completely closed shaft, so as to achieve no shaft seal, no leakage. 2. ABS device without leakage pump ABS resin is acrylonitrile - butadiene - styrene terpolymer, the main raw materials, additives for toxic, flammable, explosive materials. If using ordinary chemical process pump to transport these media, will be due to different levels of leakage and bring many problems. Since 1993, a total of 24 sets of non-leakage pumps of different specifications and models have been installed in ABS installations. These pumps run a long cycle, low maintenance and operating costs, effectively guarantee the zero leakage of the transmission medium, is the process pump in chemical production the best example of a typical example. 3. Leakage pump main techniques and should pay attention to the problem 3.1 Leakage pump main technology 3.1.1 Rotor axial force adjustment and balance 3.1.2 Cooling Lubrication measures According to the transmission medium, working conditions, shielding pump cycle There are three main ways: (1) positive cycle (2) reverse cycle (3) the outer loop 3.1.3 shielding sleeve, isolation sleeve and the gap 3.1.4 bearings and thrust plate 3.1.5 magnetic rotor 3.1.6 Condition Monitoring 3.2 None Leakage pump should pay attention to the problem 4. No leakage pump application prospects It is true that no leakage pump manufacturing costs more expensive than conventional pumps, but the use of maintenance costs than the mechanical seal pump is much lower. First of all, no leakage pump without mechanical seal and bearing box, the pump shaft is completely enclosed in the shielding sleeve (isolation sleeve), the variable seal is a static seal, effectively solve the problem of leakage and lubrication; Second, no leakage pump canceled the coupling, Harden the connection as a soft connection, effectively solve the vibration and noise problems; In addition, no leakage pump wearing parts significantly reduced (only the bearing or the mouth ring), the accident is also relatively reduced (only the inner and outer rotor); the last , No leakage pump to extend the life of the operation, maintenance frequency and time greatly reduced, and significantly reduce the labor intensity overhaul. According to the statistics of ABS device from 2000 to 2001, the damage rate of conventional pump is 6 to 8 times that of non-leak pump, and the cost of replacement of consumable parts by mechanical seal chemical pump is 3 to 5 times of that of similar pump without leakage. According to the cumulative total cost calculation, roughly 4 ~ 5 years the number of both the same. The above is only from the cost point of view, and mechanical seal chemical pump leakage of materials tend to be expensive, caused by environmental pollution, safety accidents and other issues more. Therefore, although a one-time investment without leakage pump larger, but no leakage of pollution, saving materials, maintenance and management of low cost, high overall economic efficiency, good social benefits. With economic development, social progress, state requirements for enterprises in technology, environmental protection and other fields are getting higher and higher, and vigorously promote the technology of leak-free pump technology has a good prospect.

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