Application knowledge of submersible sewage pump in engineering application

Submersible sewage pump is a pump and motor connected, and at the same time into the work of the pump liquid products, compared with the general horizontal or vertical sewage pump pump, submersible sewage pump has the following obvious advantages:

1 submersible sewage pump compact structure, small area. The submersible pump into the liquid as a result, it can be directly installed in the sewage pool, without the construction of a dedicated pump pumps and machines used to install, can save a lot of land and infrastructure costs.
2 submersible sewage pump installation and maintenance is convenient. Small submersible sewage pump free installation, large submersible sewage pumps are generally equipped with automatic coupling device can be automatically installed, the installation and maintenance very convenient.
3 continuous running time. Submersible sewage pump because the pump and motor coaxial, short axis, rotating parts of light weight, so the load bearing on the bearing (radial) is relatively small, life expectancy is much longer than the average pump.
4 there is no cavitation damage and irrigation water and other issues. Especially after a little to the operator has brought a lot of convenience.
5 submersible sewage pump vibration noise is small, the motor temperature rise is low, no pollution to the environment.
It is because of these advantages, submersible sewage pump more and more attention has been paid, use the range more widely, from the 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. In the municipal engineering, industry, hospitals, construction, hotels, water conservancy construction plays a very important role in all walks of life.
But everything is One divides into two., submersible sewage pump is the most critical problem is the usability problem, because the use of submersible sewage pump occasions in the liquid; transport medium containing solid material mixed liquid; the pump and motor is close; pump for the vertical layout, with the weight of the rotating parts the water pump impeller under water pressure in the same direction. These issues have made the submersible sewage pump in the seal, motor carrying capacity, bearing arrangement and selection, and other aspects of the requirements than the general sewage pump to high.
In order to improve the life of submersible sewage pump, most domestic manufacturers are now in the protection of the pump system to find ways that the occurrence of leakage, overload and over temperature fault in the pump can automatically alarm and automatically shut down equipment repair. But we think, in the submersible sewage pump set protection system is necessary, it can effectively protect the safe operation of the electric pump. But this is not the key to the problem, the protection system is only a remedy after the failure of the pump, is a more passive approach. The key to the problem should be from the fundamental, completely solve the pump in the seal, overload and other aspects of the problem, this is a more proactive approach. For this purpose, we put the Deputy impeller fluid power sealing technology and pump non overload design technology used in submersible sewage pump, a greater increase the pump seal availability and load capacity, extend the service life of the pump.
Application of auxiliary impeller fluid power sealing technology
The so-called hydrodynamic impeller seal Deputy refers to the installation of an open impeller in the opposite direction near the back of the coaxial pump impeller hub. When the pump work, vice impeller with the pump with the rotating spindle, the Deputy impeller with the liquid will rotate, rotation of the liquid will produce an outward centrifugal force, the centrifugal force on the one hand the flow of mechanical seals to withstand the liquid, reducing the mechanical seal pressure. On the other hand, the solid particles in the medium are prevented from entering the friction pair of the mechanical seal, and the wear of the mechanical seal grinding block is reduced, and the service life of the machine is prolonged.
Vice impeller play a role in addition to sealing, but also can reduce the axial force in the submersible sewage pump is mainly in the axial force acting on the impeller on the liquid pressure force and the rotating part of the gravity of the composition, the direction of the two force is the same, efforts are made by the two forces add a. It can be seen that in the case of the same performance parameters, submersible sewage pump axial force than the general horizontal pump to large, and the difficulty of the balance than the vertical pump. So in the submersible sewage pump, the bearings are easy to damage the reason is also a great relationship with the axial force.
And if the installation of the Deputy impeller, the liquid in the impeller pressure on the direction of pressure difference is the two force in the opposite direction, so that it can offset part of the axial force, also played a role in extending the life of the bearing. But with vice impeller seal system also has a drawback, that is to be Deputy impeller part of the energy consumption, generally around 3%, but as long as the design is reasonable, can be reduced to a minimum of this part of the loss.