1. No leakage of the main type of pump and structure

No leakage pump including shielding pump, magnetic pump, positive displacement diaphragm pump, electromagnetic pump 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

In leak-free pumps, shield pumps are more widely used. 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 by the shaft and the motor shaft, respectively, the magnetic force generated by the rotor, the motor torque is transmitted to the pump shaft, and then drive the impeller to transport 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 applications

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. No leakage pump the main techniques and should pay attention to the use of the problem

3.1 no leakage pump main technology

3.1.1 Rotor axial force adjustment and balance

3.1.2 cooling and lubrication measures

According to the transmission medium, different working conditions, shielding pump cycle there are three main ways:

(1) is the cycle

(2) reverse cycle

(3) outside the loop

3.1.3 shielding sleeve, isolation sleeve and the gap

3.1.4 bearing and thrust plate

3.1.5 Magnet rotor

3.1.6 Condition Monitoring

3.2 no leakage pump should pay attention to the use of the problem

4. No leakage pump application prospects

Admittedly, a leak-free pump is more expensive to manufacture than a conventional pump, but its use and maintenance costs are much lower than those of a typical mechanical seal chemical pump. First of all, no leakage pump without mechanical seal and bearing box, the pump shaft is completely enclosed in the shield sleeve (isolation sleeve), the variable seal is a static seal, effectively solve the problem of leakage and lubrication; Second, the pump without a leak cancel 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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