IMPELLER USED IN SPIRAM PUMPS

The SPIRAM centrifugal pump uses a specially designed screw-shaped impeller to feed the pumped fluid into the conical inlet chamber. The impeller then uses the centrifugal force generated by the impeller to push the pumped fluid out of the pump.

The construction of the screw-shaped single blade is specially designed for low rotational speeds of impeller, avoiding the destruction of hydraulic parts by abrasive particles. This means that the design of the pump has been perfectly executed not only to prevent clogging but also to guarantee long lifetime of the pump.

Each screw-shaped impeller of SPIRAM pumps is designed with an emphasis on the free ball passage. Thanks to it, these pumps are able to handle solid sizes up to 100% of the discharge flange diameter.

The combination of the conical narrowing of the meridional cut, the small wrap angles of blades and the low lead-in angles of the fluid path promote movement of the product from the impeller suction side to the discharge section with minimal opportunity to cause blocking. In general, the hydraulics type involving a single bladed screw pump with an impeller eliminates the possibility of clogging it. What passes through the inlet port it will also pass through the outlet port, thanks to the volute rising towards the rear side.

Further, the hydraulics working on such a principle minimizes the time of fluid flow through the pump while reducing the abrasive effect to the pump caused by gravel, sand or similar fine solids.

In addition, each SPIRAM pump is provided with a system of adjusting the clearance between the front plate and the impeller to achieve maximum hydraulic efficiency of the pump with long-term effect on the pre-set minimum power consumption of the pump unit.

The impeller of the SPIRAM pumps comes into contact with the pumped fluid at a lower percentage rate, thereby differs from common centrifugal impellers with an upstream cutting system. While other pumps cut the fibrous matters and other waste contained in the fluid into smaller parts, the impeller of the SPIRAM pump transports these materials thanks to the low shear force and its shape with no or minimal damage to its structure. All the mentioned advantages of SPIRAM pumps are available while achieving high hydraulic efficiency of the pump. The hydraulic efficiency of up to 91% for slurry
pumps is a parameter that is comparable to that of multi- blade centrifugal pumps intended for pumping clean water.

Thus, the use of SPIRAM pumps creates significant preconditions for long-term trouble-free operation at the lowest possible operating costs.