Blackhawk Equipment sells, designs and installs all types of centrifugal pump packages. Often just called fluid pumps, almost every type of refinement or manufacturing process that requires liquids, or near liquid-like fluids, to be processed, uses centrifugal pumps.
Like most types of fluid pumps, a centrifugal pump uses a motor to convert the rotational energy from the liquid spinning into energy via the moving fluid. Some of this energy is stored as kinetic energy into the fluid itself. Typically, fluid enters through a central hole inside the casing, is caught up in the impeller blades (very similar to a propeller, but for fluids), and is whirled around in a semi-spiral outward until it leaves through all the curved parts of the impeller into the diffuser part of the centrifugal pump. The fluid gains both velocity and pressure while passing through the impeller.
Keep in mind a fluid can be anything liquid-like, such as, various chemicals or compounds, sewage or even radiator fluid. The different fluid densities and other properties together with the amount of output per second and pressure create the need for various types and sizes of centrifugal pumps.
Inside most centrifugal pumps is the doughnut-shaped diffuser, or scroll, section of the pump casing which decelerates the liquid flow and further increases the pressure. It’s important to mention that the fluid is not pushed radially outward by centrifugal force, but rather by inertia, the natural tendency of an object to continue in a straight line when traveling around a circle. This is very similar to the way a spin-cycle works in a washing machine. (Or even pushing your kids around on a merry-go-round. Those little ones just want to fly right off.)
Centrifugal air compressors are also very similar to centrifugal pumps. The key difference between centrifugal compressors and fluid pumps is that the compressor working “fluid” is a gas (compressible air) and the pump working fluid is liquid (incompressible). The engineering principles used to create a centrifugal pump are basically the same as those in a centrifugal air compressor. However, there is one very important difference. Centrifugal pumps need to deal with cavitation, or basically, very small little bubbles or pockets that are formed from all the forces of the fluid moving at high speeds. When subjected to higher pressures, the bubble voids implode and can generate a substantial shock wave that causes wear and tear on the pump or later down the line inside the system. The Blackhawk Equipment team are experts in choosing the right centrifugal pump for your exact needs and have been designing and installing fluid pump systems in Colorado and internationally for years.
A centrifugal pump that has more than two impellers is often called a multistage centrifugal pump. The impellers may be mounted on the same shaft or on different shafts. At each stage, the fluid is focused to the center before spinning its way to the discharge port. Impellers inside the fluid pump can be connected in series to create higher pressures at the outlet. For higher flow output, impellers can also be connected in parallel. A common application of the multistage centrifugal pump is for a boiler pump. Blackhawk has designed many types of custom boiler units for our customers that use various kinds of fluid pumps and multistage centrifugal pumps.