The document describes the functionality and benefits of a non-blocking self-priming trash pump featuring an auxiliary impeller, which reduces mechanical force and wear on the mechanical seal, thereby prolonging its life. It also discusses challenges related to axial force and motor overload situations, emphasizing the significance of selecting pumps with full head characteristics for reliability and cost-effectiveness. The text concludes by highlighting advancements in domestic pumps that match foreign performance standards, focusing on durability and energy efficiency.

1. non-blocking self priming trash pump

2. The non-blocking self priming trash pumpThe so-called auxiliary impeller
hydrodynamic seal means that an open impeller is mounted coaxially opposite to the
back of the impeller rear cover of the pump.When the pump is working, the auxiliary
impeller rotates with the pump main shaft, and the liquid in the auxiliary impeller
rotates together.The rotating liquid generates an outward centrifugal force, which on
the one hand bears against the liquid flowing to the mechanical seal, reducing the
mechanical force.

3. The pressure at the seal. On the other hand, the solid particles in the medium are
prevented from entering the friction pair of the mechanical seal, which reduces the
wear of the mechanical seal block and prolongs its service life. In addition to sealing
function, the auxiliary impeller can also reduce the axial force. In the 6 inch trash
pump, the axial force is mainly composed of the differential pressure force of the
liquid acting on the impeller and the gravity of the entire rotating part.The direction
of action of the two forces is the same, and the resultant force is the sum of the two
forces. It can be seen that in the case of the same performance parameters, the axial
force of the submersible sewage pump is larger than that of the general horizontal
pump, and the difficulty of balancing is more difficult than that of the vertical pump.

4. Therefore, in the submersible sewage pump, the reason that the bearing is easily
damaged is also related to the large axial force. If the auxiliary impeller is installed,
the direction of the differential pressure of the liquid acting on the auxiliary impeller is
opposite to the resultant force of the above two forces, so that a part of the axial force
can be offset, which also plays a role in prolonging the bearing life. However, there is
also a disadvantage in using the auxiliary impeller sealing system, that is, a part of the
energy is consumed on the auxiliary impeller, which is generally about 3%, but as long
as the design is reasonable, the loss can be minimized.

5. In a typical centrifugal pump, the power always increases with the increase of the
flow rate, that is, the power curve is a curve that rises with the increase of the flow
rate, which brings a problem to the use of the pump: when the pump isWhen the
design operating point is running, generally, the power of the pump is less than the
rated power of the motor.The use of this pump is safe; but when the pump head is
reduced, the flow will increase (as can be seen from the pump performance curve),
The power also increases.

6. When the flow rate exceeds the design condition point flow and reaches a certain
value, the input power of the pump may exceed the rated power of the motor and
cause the motor to be overloaded and burned.When the motor is overloaded, either
the protection system acts to stop the pump from rotating; or the protection system
fails to burn the motor.The lift of the pump is lower than that of the design working
point. It is often encountered in practice.

7. In one case, when the pump is selected, the lift of the pump is too high, and in actual
use, the pump is lowered. In the other case, the operating point of the pump is not
well determined in use, in other words the pump flow needs to be adjusted
frequently; there is also a case where the pump needs to be changed frequently.
These three situations may overload the pump and affect the reliability of the pump.
It can be said that the range of use of pumps (including sewage pumps) without full lift
characteristics is greatly limited.The so-called full head characteristic (also known as
no overload feature) means that the power curve rises very slowly with increasing
flow rate.

8. More ideally, when the flow rate increases to a certain value, the power will not rise
any more, but will have some Falling, that is to say the power curve is a curve with a
hump. If so, we only need to select the power rating of the motor slightly more than
the power of the hump point, then in the entire range from 0 flow to maximum flow,
you are in that oneWhen operating at the operating point, the pump power will not
exceed the motor power and the pump will be overloaded. It is very convenient and
reliable for the pump with this performance whether it is selected or used. In addition,
the motor power does not need to be too large, which can save considerable
equipment costs.

9. The drainage pumps used in buildings include submersible sewage pump, submerged
drainage pump, vertical sewage pump and wet prime pump. Because the general site
in the building is small and the displacement is not large, the submersible sewage
pump and the submerged drainage pump can be preferentially used in the drainage
pump.The engine driven trash pump is generally used in important places; the
vertical sewage pump and the horizontal sewage pump are required to be separated.

10. The earthquake foundation, self-priming water absorption, and occupying a certain
site, it is less used in the building.
The non-blocking self priming sewage pump is developed by introducing foreign
high-efficiency energy-saving non-blocking sewage pump and domestic technical
force. All performance indexes have reached the technical level of similar foreign
products. Due to the unique single-channel impeller, the dynamic sealing adopts two
sets of special materials.Carbide mechanical seal device, with no blockage; durable,
accurate line, easy to use and maintain, high efficiency, remarkable energy saving, is
the latest product of pump upgrades in China.