Crucial point of submersible pumps pump Jinan spring Cheung

Submersible pump is a pump and motor piece, and also sneak into the sump pumps work. Advantages of the following aspects: organization, long operating time, easy installation, low noise and so on. Compared to other horizontal or vertical pumps more and more people using the Chinese name of the submersible pump crucial point Jane ???? medium power always increases with increasing flow of projects in order to improve the diving ???? sewage pump life advantages ???? point submersible sewage pump because the next job is to sneak into the fluid pump and motor a piece, and also sneak into the sump pumps work, compared with the normal horizontal or vertical pump sewage pump , submersible sewage pump obviously has the advantage of the following aspects: 1 .. Submersible sewage pump sump due to sneak into work, it can be directly installed in the sewage tanks, without the construction of pumping station dedicated to install the pump and machine, you can save a lot of land and infrastructure costs. 2. easy installation and maintenance. Small submersible sewage pumps can be installed free of large submersible sewage pumps are generally equipped with automatic coupling device can be automatically installed, installation and maintenance very easy. 3. continuous operation for a long time. Submersible sewage pump because the pump and motor coaxial, short axis, rotating parts and light weight, so a relatively small bearing on the loads (radial), life is much longer than the average pump. The absence of cavitation damage and irrigation water and other issues. Especially after it brought a lot to the operator convenience. 5. vibration noise, motor temperature low environmental pollution. It is because of these advantages, submersible sewage pump has been more and more attention, more and more widely used range from the original simply used to transport water to the present can transport all kinds of domestic sewage, industrial waste, construction site drainage, liquid feed and so on. It plays an important role in municipal engineering, industrial, hospitals, buildings, hotels, water conservancy construction and other industries in. But everything is divided into two, the submersible sewage pump is the most critical issue is the reliability issue, because the use of submersible sewage pump is in fluid situations; medium transport are some of the mixed liquid containing solid materials; Pump and motor are very close; pump for vertical layout, rotating parts to withstand the weight of the impeller water pressure in the same direction. These problems are made in submersible sewage pump seals, the motor bearing capacity, bearing arrangement and selection and other requirements than the average sewage pump higher. To improve the submersible sewage pump life, and now most of domestic and foreign manufacturers are wanted on the pump protection system approach, which leak in the pump, capable of automatic alarm overload, over-temperature fault, and automatically shutdown equipment repair. But we believe, set up to protect the system submersible sewage pump is necessary, it can effectively protect the safe operation of the electric pump. But the key is not the problem, the protection system is only a remedy after a pump failure, is a more passive approach. The key question should proceed from the fundamental, completely solve the problem pump seal, overload, etc., this is a more proactive approach. To this end we expeller fluid power sealing technology and pump design technology used without overload submersible sewage pump, the pump seal greatly improved reliability and load capacity, extend the life of the pump. First, the application of the so-called vice impeller fluid power sealing technology vice impeller fluid power sealing means near the rear of the rear cover of the pump impeller in the opposite direction to install a coaxial open impeller. When the pump is working, deputy impeller rotates together with the pump shaft, expeller liquid will rotate together, the rotation of the liquid will produce an outward centrifugal force, the centrifugal force on the one hand against the flow of fluid mechanical seal, reduces the mechanical pressure seal at. On the other hand to prevent the media of solid particles into the mechanical seal friction, the reduction of the mechanical seal grinding block wear and prolong its service life. But deputy impeller sealing effect, but also may help reduce the axial force, the axial force composed mainly by fluid pressure differential force of gravity on the rotation of the impeller and the entire portion of the sewage pump, which the direction of action of the two forces are the same, they are added together is formed by two forces. It can be seen in exactly the same performance parameters, submersible sewage pump axial force than the average horizontal pumps to be large, while the balance of difficulty harder than the vertical pump. Therefore, sewage pumps, bearings easily damage their cause and axial force has a great relationship. If the installation Vice impeller, the liquid in the direction of the sub-wheel differential force is the force of the two opposite forces, which can offset part of the axial force, also played a role in extending bearing life. But with deputy impeller sealing system also has a drawback, that is in the sub impeller part of the energy is consumed, usually around 3%, but as long as the design is reasonable, can reduce this part of the loss to a minimum. Second, no overload design technology application in general centrifugal pump, the power always increases with increasing flow, that is, the power curve is the one with the increased flows upward curve, which pump use will bring a question: when the pump is running at design point when, in general, the pump motor power is less than the rated power, the use of this pump is safe; but when the pump head is reduced, the flow will increase ( ), power also increases from the pump performance curve can be seen. When the traffic flow exceeds the design point and reaches a certain value, the pump motor input power may exceed the rated power and causing the motor overload and burn. Motor overload protection system running either the pump stops operation; or burn the motor protection system failure. Pump head lower than the design conditions point lift for use in practice is frequently encountered situation is when the pump selection, pump head selected too high, but the actual use of the pump is lower lift use; the other is that, in use, the pump operating point is not well determined, in other words the pump flow require frequent adjustment; there is a situation that requires frequent change of venue pump use. Three cases were unfamiliar overload may affect the pump pump reliability. It can be said, for there is no full head pump characteristics (including submersible sewage pumps), its use will be limited largely. The so-called full head properties (also known as non-overload characteristics) refers to the power curve with increased traffic and rising very slowly, it is desirable that when the flow reaches a certain value, the power not only will not rise again, it will be drop, meaning that the power curve is a curve hump, if so, we just select the motor rated power exceeds the power slightly hump point value, then the entire range of zero flow to maximum flow, regardless of the one you run on operating point, the pump power will not exceed the motor power leaving the pump overload, have this capability for a pump, either during the selection or use, will be very convenient and reliable. Also with motor power and need not be too large, it can save considerable cost of equipment.