There are several ways to reduce the radial force

The method of reducing the radial force is usually the following: ① the use of double volute casing pump volute made with two staggered 180 degrees of the tongue, the fluid is divided into two equal parts, due to symmetry, Resulting in two opposite radial thrust, which can reduce the bearing radial force. However, the double volute structure to cast, clear sand brought many difficulties, in fact, less used. ② using circular pump body radial force generated in the pump off point (referring to the pump's outlet valve is fully closed, the flow is zero), and the highest point of efficiency between the volute-type pump body is smaller, Especially in the most efficient point, the best way to reduce the radial force. However, this pump body hydraulic performance slightly worse than the volute. ③ using multi-channel pump In theory, multi-channel pump radial force can make zero, so that bearings are not subject to radial force, in fact, due to manufacturing errors, the channel is not fully symmetrical and other reasons, radial Force is not easy to eliminate completely. The method of reducing the axial force is as follows: ①Automatic thrust balance device is used to eliminate the pressure balance between the front and the back of the impeller by the fluid force by the fixed and variable throttle rings on the back of the impeller disk Axial force. Under normal circumstances, the thrust bearing is not force, only in the start-up and accidental circumstances, the thrust plate will contact with the bearing thrust surface. ② the use of back-impeller thrust balance mechanism in the impeller with a radial arrangement of the back of the blade, but also greatly reduce the axial force. ③ balance plate structure of the above methods, each with its own advantages and disadvantages, need to be based on practical experience and the overall design of the pump to consider and choose. (3) Shield Shield Shield pump usually has 2 shielding sleeve, that is, the stator shielding sleeve and rotor shielding sleeve, used to prevent the invasion of the working medium stator windings and rotor core. Due to the presence of the shielding sleeve, the gap between the stator and the rotor of the motor is increased. At the same time, eddy currents are also generated in the shielding sleeve, which increases the power loss and reduces the performance of the shielding motor. In general, shielded motors are less efficient than those used in conventional centrifugal pumps and are within about 5%. For shielding pumps, the shielding sleeve should be used with good corrosion resistance, high strength non-magnetic materials, in order to reduce the loss caused by the presence of the shielding sleeve, the design must pay attention to shielded motor diameter is small, the thickness of the shielding sleeve To thin, shielding sleeve material should be non-magnetic material. Therefore, the general use of shielded motor slender structure, that is, the core length and the ratio of the larger diameter. Shielding material selection of good corrosion resistance, high strength non-magnetic materials, such as austenitic stainless steel, Hastelloy, Hastelloy C, titanium and so on. Hastelloy material produced eddy current losses smaller, the stator shield preferred Hastelloy, rotor shield sleeve optional Hastelloy or austenitic stainless steel. The thickness of the shielding sleeve is generally 0.4 ~ 0.7mm, thick shielding sleeve can provide a more robust structure, but also caused a large energy loss, the actual design, often use both adequate security without causing too much loss compromise Program.

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