(1) Hydraulic components Shielding pump hydraulic components can be used with the same type of seal pump. Can be used to seal the hydraulic pump motor and shielded motor shield to form a combination of general centrifugal pump impeller, scroll housing and import and export of flange structure used in the shield pump. Today's latest valid order information free to send! Morning latest buyers information free to send! Punch grab Rob here! (2) Bearing Due to the rotor is longer, the shield pump needs two sliding bearings before and after. Diaphragm pumps require accurate alignment of these two bearings. If poor alignment, the bearings are very easy to crack. Shielded pump sliding bearings are used liquid lubrication. In order to facilitate the liquid lubrication, the inner wall of the sliding bearing and the end surface in contact with the thrust plate are generally provided with diversion grooves. According to the distribution shape of the diversion grooves, the diversion grooves of the normally open perimeter of the shielding pump are straight grooves, spiral grooves or straight grooves And spiral groove. Common sliding bearing materials are as follows: Pneumatic diaphragm pump â‘ graphite material is relatively soft, and has very good self-lubricating. In order to improve its wear resistance, graphite impregnation is usually done, there are common impregnated resin and impregnated metal and other forms. Graphite sliding bearings and surface surfacing tungsten, chromium, diamond and other hard alloy or plasma-sprayed silicon nitride sleeve made of a class of hard alloy friction pair, the service life of up to one year. â‘¡ silicon carbide silicon carbide bearing capacity, wear resistance, high hardness, but also a very good sliding bearing material. If used in good condition, pure sintered a-grade silicon carbide sliding bearings life of up to three years. â‘¢ filled with PTFE in the transport of some highly corrosive media, the sliding bearings can also use PTFE filled carbon fiber, glass fiber and other non-metallic materials. â‘£ In some special occasions, you can also choose ceramic or metal shield pump bearing material. Because shielded pump bearings do not use oil lubrication, so it can withstand smaller radial loads and axial loads. Design, we must adopt a variety of ways to reduce the bearing load. The method of reducing the radial force is usually the following: â‘ the use of double volute casing pump volute made with two staggered 180 degrees of the barrier, 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. The use of circular pump body radial force generated in the pump off point (refers to the pump's outlet valve is fully closed, the flow is zero), and the highest efficiency point range than the volute-type pump body is small, 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. â‘¢ 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: â‘ Automatic 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. â‘¡ 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. â‘¢ 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, electric diaphragm 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 shielding sleeve, the design must pay attention to shielded motor diameter is small, The thickness of the shielding sleeve to be 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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