What is the sealing technology of Submersible sewage pump? The so-called auxiliary impeller hydrodynamic seal refers to the installation of an open impeller in the opposite direction of the coaxial direction near the back of the impeller rear cover of the pump.

When the pump is working, the auxiliary impeller and the pump main shaft rotate together, and the liquid of the auxiliary impeller also rotates together. The rotating liquid generates centrifugal force outwards. This centrifugal force prevents the liquid flowing to the machine seal and reduces the pressure of the machine seal.
On the contrary, it prevents the solid particles on the medium from entering the friction pair of the mechanical seal, thereby reducing the wear of the mechanical seal wear block and prolonging the service life. The auxiliary impeller can not only play the role of sealing, but also play the role of reducing the axial force. In the submersible pump, the axial force is mainly composed of the pressure force of the liquid acting on the impeller and the gravity of the entire rotating part. The direction of action is the same, and the resultant force is composed of the resultant force of the two forces. When the performance parameters are exactly the same, the axial force of the Submersible sewage pump is larger than that of the general horizontal pump, and the balance is more difficult than that of the vertical pump. Therefore, the bearing on the Submersible sewage pump is easily damaged because it has a lot to do with the axial force. If the auxiliary impeller is installed, the direction of the pressure difference of the liquid in the auxiliary impeller is opposite to the combined force of the above two forces, so it can offset part of the axial force and prolong the life of the bearing. However, the use of auxiliary impeller sealing systems also has disadvantages. In other words, some energy is consumed on the auxiliary impeller, usually about 3%, but if the design is reasonable, this part of the loss can be minimized.
What are the precautions for using Submersible sewage pump?
(1) When the humidity sensor or temperature sensor issues an alarm or the vibration and noise of the pump body is abnormal when the pump body is working, or the water pressure of the outlet quantity drops, and the power consumption increases significantly, the downtime of the Submersible sewage pump should be checked immediately.
(2) Some unsealed submersible pumps are immersed in water for a long time, even if they are not used, the insulation value will gradually decrease, and eventually they cannot be used. Spontaneous combustion will occur even if the working time is shorter than that of a continuously working submersible pump in the water. Therefore, sometimes the submersible pump cannot be spared in the suction tank. If conditions permit, intervention and preparation can be made outside the pond. When the working submersible pump fails, it immediately stops running, and puts down the standby pump after ascending.
(3) Submersible sewage pump cannot be opened too frequently and stopped. Otherwise it will affect the life of the submersible pump. After the Submersible sewage pump is stopped, the water in the pipeline will return, and it will be restarted immediately. When the electric pump is started, the load will be too heavy and will bear unnecessary shock load. In addition, if the submersible pump is turned on too frequently and stops, the parts with reduced impact may be damaged, and the entire electric pump may also be damaged.
(4) After stopping, the motor cannot be restarted before it stops working completely.
(5) Cut off the power when checking the electric pump.
(6) When the Submersible sewage pump is running, do not wash objects, swim or put livestock in the water nearby. When the electric pump leaks, please do not get an electric shock accident.