In order to solve the problem in a sealed submersible sewage pump, overload, etc., Wenzhou, the vice-resistant impeller fluid power valve sealing technology and pump design technology used without overload submersible sewage pump, the greater reliability and improved pump seals carrying capacity, extend the life of the pump.

          Use a vice impeller fluid power sealing technology

          The so-called vice impeller fluid power sealing means installing an open impeller near the back of the cover in the opposite direction after the coaxial pump impeller. When the pump is working, vice impeller rotates together with the pump shaft, impeller deputy liquid will rotate with 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, reducing 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, can also play a role in reducing the axial force, axial force composed mainly by the action of liquid pressure force of gravity on the rotation of the impeller and the entire section of the submersible pump, which the direction of action of the two forces are the same, are added together is formed by two forces. It can be seen that in the case of identical 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. So submersible sewage pump, the reason is easy to damage the bearing axial force has a great relationship. If the installation Vice impeller, the liquid in the direction of the Vice impeller pressure force is opposite the two forces together, so you can offset part of the axial force, also played a role in extending bearing life. However, the use of auxiliary impeller sealing system also has a drawback that the deputy impeller consume some energy, usually around 3%, but as long as the design is reasonable, this is entirely possible to reduce some of the losses to a minimum.

Second, the pump is no overload design technology applications

In a typical centrifugal pump, the power always increases with increasing flow, that is, the power curve is the one with the increase in traffic and the rising curve, which is the use of the pump creates a problem: when the pump design point operation, in general, the pump motor power is less than the rated power, the use of this pump is safe, but when the pump head decreases, the flow will increase (can be seen from the pump performance curve), power also increases. When the traffic flow exceeds the design point and reaches a certain value, the pump input power may exceed the rated power and causing the motor overload and burnout. Motor overload protection system running either the pump stops the action; or protection system failure motor burned. Pump head is lower than the design conditions point lift 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 of the pump operating point is determined not so good, in other words the pump flow require frequent adjustment; Another is the use of a pump requires frequent change of venue. These 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 is limited to a large extent. The so-called full head properties (also known as non-overload characteristics) refers to the power curve with traffic increases 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 decline, that the power curve is a hump in the curve, and if so, we simply choose the rated power of the power a little over the hump point value, then in the maximum flow of traffic to the whole range, whether you work in that one runs on the operating point, the pump will not exceed the power leaving the pump motor power overload, for this performance with a pump, either during the selection or use, will be very convenient and reliable. Also worthy of motor power also need large, you can save considerable cost of equipment.