Improper use caused by stainless steel multi – stage centrifugal pump failure
There is a certain use of technical requirements in the use of stainless steel multi-stage pump , if not according to the technical requirements of the manufacturer, the use will have a failure.
1.Such as in the pump installation, can not be installed according to the installation instructions correctly, resulting in vibration pump, so that the mechanical seal end of the pump fit is not good enough, or make the end face to open a fault, so that leakage of the seal.
2.Stainless steel multi-stage centrifugal pump operation due to exhaust is not sufficient or other reasons to make the gas inside the sealed cavity, running in the sealed chamber under the action of pressure, so that the moment caused by friction pairs of sealing leakage failure.
3.The circulatory system is not clean or clean filter is not clean, poor water quality, foreign body, sludge, etc., so that friction surface wear can also cause serious failure.
4.In the stainless steel multi-stage centrifugal pump running due to sudden pressure fluctuations, resulting in pulse pressure or frequent start may make the transmission parts, anti-rotation parts of the weak links damage, resulting in mechanical seal failure. Therefore, the user to use the high-pressure boiler to the pump first to solve the correctness of the power plant process, in the process of running to minimize pressure fluctuations, reduce the number of frequent start. In addition, in the design of the mechanical seal to consider the wear torque from the transmission ring to the shaft and from the static ring to the pump stator and the starting force from the shaft to the transmission ring on the transmission system when the strength of the calculation and selection to avoid Produce the above problems.
- Published in blog
Modification of Defects in Design of Sewage Pump
Coupling of the transformation. After comparison, the coupling was improved. And the positioning of the half-ring with the positioning of the shaft, the shaft is driven by the key, half-card ring and up and down the axis to match, to ensure that the upper and lower axis positioning, the upper and lower shaft axial size can be through the fit The radial dimension of the shaft is mainly ensured by the coupling accuracy of the sleeve and the upper and lower shafts and the axial positioning of the retaining ring, as shown in Fig. This is a better method of jointing, reducing the length of the rotor, limiting the verticality, strong, eliminating the rotor up and down the movement problem, improve the stability of the operation. Reconstruction of the middle of the pump. After accounting, we put the liquid pump liquid from the original length of 3600mm to 3000mm shortened, shortening each segment 200mm, support spacing reduced, greatly improving the rigidity of the rotor, the hub of the rotor Ye Lun found pendulum is 0.45 ~ 0.7mm, the guide satisfies Bearing on the deflection angle requirements. In order to ensure that the depth of the suction in the same, in the suction port to increase the length of the suction pipe. Increase throttle device. Add a long throttling bushing behind the impeller to reduce the pressure behind the impeller and open four ¢ 50mm holes in the support tube to increase the leakage of the media at the support tube.
- Published in blog
Application of submersible sewage pump in ore field
Submersible sewage pump in the field of ore applications more and more popular, in order to apply different environmental requirements, production processes, product performance, also need to have a new upgrade. The future, mine submersible sewage pump will move in what direction?
1. Technological innovation will lead the new technology, new materials continue to mine submersible sewage pump production in the use. For example, the traditional casting process to more advanced stainless steel stamping welding process development. Stainless steel stamping welding multi-stage pump core components using stainless steel sheet, with die stamping, with high reliability, good sealing, high precision, its hydraulic performance and pump efficiency is generally better than the casting process production of submersible sewage pump , Stainless steel stamping welding process is mine submersible sewage pump future development trend.
2. Design to more efficient, energy saving, environmental protection direction. For example, oil-filled motors are designed to develop environmentally friendly water-filled motors. Oil-filled submersible motor cavity filled with medium for the mechanical oil, and water-filled submersible motor cavity filled with water, one of its advantages is zero pollution of water, more environmentally friendly. In addition, with the frequency conversion technology in the application of motor design gradually popular, the future mine submersible sewage pump will be more efficient, energy saving.
3. Integral design to the development of removable modular design, that is, motor and pump parts and other modular combination to facilitate the disassembly and replacement of damaged parts, to extend the life of the pump, reducing the use of cost purposes.
Mine submersible sewage pump in foreign countries also has a broad market, but also need to ZTE water production enterprises to actively improve product performance, enhance the application effect, for the depth of overseas markets to fully prepared.
- Published in blog
Structural features of submersible sewage pump
Submersible sewage pump, the pump uses a half-open new impeller, the pump efficiency can be increased by 30%. Beautiful appearance, small size, light weight, large flow, over-current part of the suction structure, strong sewage capacity, not because of small solid Particles or fibrous inhalation, and will not be damaged prematurely by the inhalation of abrasive media. The overall structure of the pump is simple, easy loading and unloading and maintenance. It is absolutely safe and reliable in the working surface containing gas and coal dust, and the silencers with independent intellectual property rights in the exhaust port have greatly improved the conditions of underground construction condition.
Structural features: Pneumatic motor part: by the rotor, leaves, cylinder, shell, upper and lower cylinder head, roof and other components. The rotor has four uniform distribution of the radial groove, slot with the blade, the upper and lower cylinder head each have a blown eye, the air pump starts, the high pressure gas from the inflatable eye to open the leaves of the leaves, while a large number of High pressure gas from the main duct into the cylinder, pushing the blade, driving the rotor rotation work. In the bottom of the shell with a sealed cavity, cavity with a gas ring, the water separated, the use of gas and water pressure, so that the ring rose, enhance the sealing effect.
- Published in blog
What should pay attention when use deep well submersible pump?
Start deep well submersible pump, should be smooth rotation, no vibration and abnormal sound, observe the motor running current and line voltage before and after the start of any significant fluctuations. Pay attention to the first installation or maintenance after the operation of the submersible pump, test machine can only start on the ground in order to observe, if found submersible pump abnormalities, should immediately stop, check the direction of rotation is correct, the installation is appropriate, find the reasons after troubleshooting run. Lifting should pay attention to protect the cable to prevent damage, the lifting device (such as tripod, hoist or electric hoist, etc.) should be greater than the weight of the submersible pump, and leave enough room. Before the hanging of the artificial rotation of the impeller to check whether the rotation is flexible, the main contactor contact contact is good, cable and cable joints with or without rupture, abrasion marks, motor shell grounding is reliable, and check the three-phase circuit with a multimeter line conduction.
- Published in blog
Why do the liquid of centrifugal pump back-flow?
The flow of liquid is maintained by the energy gradient. When the flow is reduced to near zero, the impeller may increase the peripheral velocity around the inlet due to the action of the inertial force of the liquid, so that the energy near the wall increases, which keeps the liquid flowing The energy slope necessary for the flow of the line no longer exists, so that the flow near the impeller inlet is reversed. The centrifugal pump head is constant for a given impeller diameter and flow, whereas the moving head is a function of the flow. At some point on the head flow curve, once the lift head exceeds the centrifugal head, then the pressure gradient at these points , Resulting in the opposite direction of flow, that is, the phenomenon of reflow.
General centrifugal pump to set the return line, one can act as the minimum return line, when the user flow is less than the rated flow of 30% of the pump, the role of the protection of the pump; Second, the tank of material flow, Some places have dead zones, material aggregation, precipitation, deterioration and so on.
- Published in blog
Sewage pump motor production
Lanshen Group is able to produce its own pump core components – motor.
Coil motor used in sewage pump is a copper coil.
Lanshen group is submersible wastewater pumps manufacturer, submersible pumps manufacturer, sewage pumps manufacturer.
- Published in blog
Submersible pump sediment concentration and motor winding temperature
If there is no safety valve, blindly raise the temperature of the magnet wire, such as 180 ℃, 200 ℃, or even 240 ℃, the probability of explosion will be higher. This is because the winding temperature is getting higher and higher, it will produce saturated steam to provide higher temperature, more heat, will lead to higher and higher vapor pressure, but increased the risk of explosion.
If there is no safety valve, must not simply use the method to improve the temperature of the wire temperature.
In the field, once the concentration of sand is too high, the winding will heat over limit, the electromagnetic wire will quickly aging. After the sediment row, due to “overload injury”, the motor thermal load capacity will be greatly reduced, often in the back row of water, the winding short-circuit breakdown, causing the motor explosion. It is this explosion in the water illusion, confused people, for many years, can not find the reasons for the explosion of submersible pumps.
- Published in blog
How to ensure the high efficiency of multi – stage centrifugal pump
If you want to ensure the high efficiency of multi-stage centrifugal pump, then the factors which affect the multi-stage centrifugal pump will be destroyed or controlled within a certain range. We want to know the efficiency of multi-stage centrifugal pump is the volume, hydraulic and mechanical efficiency of the three multiplication of the results. Here we have to talk about the cause of multi-stage centrifugal pump to reduce the effectiveness of what causes.
1. The effect of the pump itself will cause a great impact, the same conditions under their efficiency difference of up to 15%.
2. If the multi-stage centrifugal pump his operating conditions lower than expected, then the pump performance will decline, the energy consumption increased.
3. motor his efficiency is generally not change, so we must be careful when choosing the motor.
4. To pay attention to the efficiency of his machinery will have an impact on the quality, so when we choose a good pump, after the management of the impact is very small.
5. Hydraulic friction and resistance are collectively referred to as hydraulic losses. If the pump after a period of operation, it will inevitably make the impeller wear, this time the loss of water will increase.
6. Because the filter cylinder will appear toxins, intake and other issues, these problems will affect the multi-stage centrifugal pump his evacuation and operation.
7. Before we open the pump operation, pay attention to the appropriate preparation work, if it is not in place so there will be pump cavitation problems, but also make the pump increase the amount of noise, pump efficiency will decline.
- Published in blog
Causes of Leakage of Stainless Steel Centrifugal Pump
Stainless steel centrifugal pump in the operation of the sudden leakage is mostly due to changes in operating conditions or operation, improper maintenance caused.
1) Take the time, cavitation or a long time to suppress pressure, leading to seal damage;
2) The actual output of the pump is too small, a large number of media pump cycle, the accumulation of heat caused by media gasification, resulting in sealing failure;
3) For a long time outage, restart the manual when there is no manual car, friction due to adhesion and tear off the sealing surface;
4) Medium corrosive, polymerizability, gelatinous material increased;
5) Sudden changes in ambient temperature.
So Nanjing lanshen Pump Corp.LTD., to remind you, pay attention to the daily protection of the pump, do not have to start a long time to do the appropriate treatment, pay attention to the pump operating conditions
- Published in blog