Submerged pump structure and application reform

Xinjiang Non-ferrous Metal Submerged Pump Structure and Application Transformation Zhang Xue-nu (Xinjiang Xunkang Smelter Power Plant 831500) 1 Membrane The submerged pump used in our factory is a corrosion-resistant vertical pump whose overflow components are immersed in the conveyed In the medium, the transmission shaft maintains its stability through the bearing and the bearing components. The weight and axial force of the pump are transmitted to the foundation through the bearing. According to the requirements of the process device, the submerged pump should have a certain insertion depth.

The structural design of this pump mainly considers the following two factors: 1. Medium characteristics According to the corrosiveness, volatility, solid particle size, concentration, etc. of the conveying medium, the impeller type, material, bearing, seal, and flushing method are determined.

1.2 Conditions of use The temperature of the pumping medium determines the type of support, the cooling structure, and the presence or absence of an insulating jacket. According to the requirements of the pump, the insertion depth of the pump body can be reasonably determined and it belongs to a submerged pump that can be started at any time. The pump body insertion depth must be long enough to submerge the pump body and ensure that the submerged pump can be started at any time, such as sulfuric acid. The submerged pump used in the production pump and the wet smelting plant; the submerged pump of the effluent nature of the sewage, the use requirement is that after the sewage is full, the submerged pump is started, and the sewage is stopped after the clean sewage is sucked. Under this condition, the insertion depth of the pump body of the submerged pump can be designed to be short, and the insertion depth can be supplemented by installing the suction tube to suck the liquid. The shortening of the insertion depth of the pump body helps to improve the reliability of the pump and reduce the cost.

2 submerged pump structure 2. The typical structure is a double bearing submerged pump profile, the bearing is rigid, usually using rolling bearings, the upper bearing is a pair of installed angular contact ball bearings or radial ball bearings, the lower bearing is centripetal ball Bearings or cylindrical roller bearings. This configuration can withstand two-way axial force and a certain radial force. This pump uses a centrifugal impeller, which is suitable for applications with low solids content. Rotary and mixed-flow impellers are also used according to the specific characteristics of the medium.

2. Some of the variants are structurally constrained. When the speed of the double-bearing submerged pump is n=1500r/min, the depth of insertion of the pump body is 1999. The copper system of the Fukang smelter in 1999 was designed and constructed with dilute sulfuric acid up to 200g in 2000. Using the 316L shaft, after experiments and demonstrations, it was decided to fully promote the 45 steel anticorrosion shaft and put it into use in production. After more than one year of production, the shaft of the 45 steel anticorrosion treatment is in good condition, which greatly reduces the cost of spare parts, reduces the time and cost of equipment maintenance, and improves the operation rate of the equipment.

4 Conclusions (1) According to the production practice of our factory, 45 steels were used for epoxy glass steel anti-corrosion treatment, together with PTFE pads, to achieve the end face of the sealing shaft, in the sulfuric acid medium (sulfuric acid is less than 200g, temperature (3) coating due to Thin, in the installation and use should be fully considered, not due to collision, friction caused by hard injuries, end seals and reliable, in order to maximize the life of the anti-corrosion shaft. Received: 2001-11-30, Xinjiang non-ferrous metals (1) pump With a suction pipe, the length of the suction pipe is determined according to the sucking capacity of the pump, usually below 2 500 mm. This variant is not suitable for the conditions of starting at any time, but it works well for the working conditions of the emptying of the sewage.(2) The bearing frame is located Below the bottom plate, this kind of variant increases the insertion depth of the submerged pump equal to the support span, and for the high-speed pump, the insertion depth increases considerably, for example, this type of medium is very corrosive to the medium or the medium is expensive and difficult to recycle. Under the circumstances.

1. Bearing frame 2. Base plate 3. Shaft 4. Support tube 1. Upper bearing housing 2. Base plate 3. Bearing frame 4. Lower bearing housing 5. Pump body 6. Impeller 7. Pump cover 8 discharge tube 5. Shaft 6. Support tube 7. Pump body 8 Impeller 9. Pump cover Fluoroplastic structure When the pump is used to transport highly corrosive media, the cost of the pump is high due to the high price of corrosion-resistant metallic materials. The use of fluorinated plastic technology can effectively lining a certain thickness of fluoroplastic on the surface of parts that are in contact with the medium to prevent corrosion and reduce costs.

3 Bearing Lubrication and Underwater Bearing Lubrication 3.1 Bearing Lubrication The long axis submerged pump should have at least one support that is rigid. To withstand the axial force and limit axial shaft deflection and radial deflection. The lubrication method is generally grease-lubricated and is grease-filled by an oil cup.

3.2 Underwater bearings and flushing methods Long-axis submerged pump The submerged bearings are mostly plain bearings. Sleeve bearings, bushings and bushings are key components. Different working media require different bushing and bushing materials. The clearance between bushings and bushings is also very important. If the clearance is too small, due to the misalignment of parts processing and assembly, there will be large mechanical wear and even the phenomenon of holding the shaft. If the clearance is too large, the rigidity of the shaft system is damaged, the critical speed is low, and the pump operation is easy to generate vibration, which seriously affects the service life. According to experience, the sleeve and bushing are usually selected with H8/d8.

During the operation of the pump, the wear of the bushing and bushing will generate a lot of heat, and the dry grinding will increase the degree of wear. For this reason, it needs timely cooling; at the same time, when the cooling liquid flows through the grinding surface, the friction coefficient is reduced, and Lubricate the bearing, reduce power consumption, increase pump efficiency, and extend bushing service life.

The long-axis submerged pump generally has two types of flushing methods: the flushed liquid is used as the flushing liquid to be delivered by the flushing; the external flushing is usually performed using tap water or a clean oil as the flushing liquid. The flow rate of the flushing fluid is usually 0.3~0.6m3/h, and the pressure is 0.2~0.4MPa.

4 Application and Modification 4.1 Overview The pump used in the Fukang Smelter Sewage Precipitation Oxidation Pond is an XWIM 80 medium with a maximum particle size of 200mm, which is suitable for sewage discharge from factories and cities.

4.2 Application 1 The pump is located far away from the pumping station. There is no clean water source in the pump room. The pump flow is 80m3/h, head is 12m, the motor speed is 1450T, ―., Zhang Xue nuclear: structure and application of submerged pump. The length of the pump is 2534mm. The working principle of the pump is that when the impeller rotates, the liquid in the pump is generated. Stronger rotational movement, the pressure in the center of rotation is low, the liquid is sucked from the suction inlet, and at the same time, due to the high external pressure, the liquid is pressed out and the head is generated.

The pump part adopts the bearing box structure and the lower part uses the graphite bearing structure. Such sliding bearings must use pressurized clean water as their rinsing fluid. Because there is no clean water source for the flushing fluid in the area where the pump is located, the graphite bearing is rapidly burned. After the technical transformation, the lower graphite bearing is converted into a 1509 bearing. The bearing box is sealed with oil seals and linoleum, although the working life of the pump is slightly. There are improvements and the average operating cycle is around 720h, but its maintenance costs remain high, and the operation rate is extremely low. It still can not meet the requirements of the plant department for the overflow of sewage.

8. Shaft sealing body 9. Pump body 10. Impeller 11. Suction pipe part 12. Outlet bend pipe 4.3 Modification measures The oxidation pond vertical sewage pump function of the smelter is to pump sewage from the whole plant ditch to the oxidation pond for sedimentation, avoiding Sewage overflows, causing environmental pollution. The pump uses a float relay to control the start and stop of the pump. The sewage fills up to the top float position, the pump starts, and the pump stops when the net sewage is sucked to the lower float position. The pump ignores the working environment, the characteristics of the medium, and the conditions of use during its selection. There is a large selection problem. For a long-term, stable operation of the pump, the pump must be extensively retrofitted. Through analysis, the insertion depth of the pump body can be designed to be short, and the insertion depth can be supplemented by installing an inhalation tube to suck up the sewage. The shortening of the insertion depth of the pump body can increase the rigidity of the shaft, which will definitely increase the reliability of the pump.

By field measurement and calculation, the pump shaft is shortened to 983mm to remove the lower bearing part of the pump, and a bearing box is installed at 200mm above the maximum surface of the sewage. Through calculation and consideration of common use with other equipment, the bearing adopts 309-ball axle, and the calculation is as follows: 1450i/min, calculated as d>21mm. The diameter of the shaft mounted on the shaft of the pump is selected as 45mm. See the structure of the bearing coupling tube after the pump transformation.

After the above transformation, the reliability of the pump has been greatly improved in operation, the operating life has exceeded 5(1)0h, and the maintenance cost has also been reduced by more than 60%. After actual operation, it was proved that the pump transformation was successful. The data is shown in Table 1. Table 1 Pumpshaft Long average operating cycle Annual consumption of material costs (yuan) After transformation 1. Shaft 2. Ball bearing 3093. Bearing coupling pipe 4. Equipment selection for the next pipe fitting is directly related to the equipment operating conditions. I hope this article can be relevant. My colleagues are inspired.

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