Blackmer was incorporated in 1903 and is the leading manufacturer of positive displacement pumps, centrifugal pumps and compressors for the transfer of liquid and gas products worldwide. Positive displacement pump technologies include sliding vane, eccentric disc and peristaltic hose.
The sliding-vane pump and centrifugal pump lines are characterised by proven life-cycle cost features. The compressor technologies include reciprocating, rotary vane, and screw.
Through a global network of distributors and original equipment manufacturers’ base channels, Blackmer serves the following markets: refined fuels, pulp and paper, oilfield, wastewater, food/sanitary, military/marine, transport and chemical process.
Blackmer – Pumps
Sliding-vane pumps: These pumps have a number of vanes that are free to slide into or out of slots in the pump rotor. When the pump driver turns the rotor, centrifugal force, rods, and/or pressurised fluid cause the vanes to move outward in their slots and bear against the inner bore of the pump casing, forming pumping chambers. As the rotor revolves, fluid flows into the area between the vanes (pumping chambers) when they pass the suction port. This fluid is transported around the pump casing until the discharge port is reached. At this point the fluid is squeezed out into the discharge piping.
Eccentric-movement pumps: These pumps consist of a cylinder and a pumping element mounted on an eccentric shaft. As the eccentric shaft is rotated, the pumping element forms chambers within the cylinder, which increase in size at the intake port, drawing fluid into the pumping chamber. The fluid is transported to the discharge port, where the pumping chamber size is decreased. This action squeezes the fluid out into the discharge piping.
Centrifugal pumps: The simplest type of centrifugal pump is the single-stage machine that consists fundamentally of a rotating element, called an impeller, and a casing. Liquid is led to the eye, or centre, of the impeller and is set into rotation by the impeller vanes. By virtue of centrifugal force the liquid is thrown from the rim or periphery of the impeller with considerable velocity and pressure. The casing, which closely surrounds the impeller, has a volute-shaped passage of increasing area, which collects the liquid leaving the impeller, and converts a portion of its velocity energy into additional pressure energy. This casing passage leads to the discharge nozzle of the pump, where it is forced into the discharge piping.
Peristaltic (hose) pumps: The principle of the peristaltic hose pump is based on the alternating contraction and relaxation of the hose, forcing the contents through the pump and into the discharge piping. A smooth-walled, flexible hose is fitted in the pump casing, and is completely squeezed between two shoes on the rotor and the inside of the pump casing. The rotating action moves the product through the hose at a constant rate of displacement without slip. The hose’s restitution after the squeeze produces an almost-complete vacuum that draws the product into the hose from the intake piping. The pump casing is half-filled with lubricant to cool the pump and lengthen the service life of the shoes and hose. Since the product only contacts the hose and not the internal pump components, this pumping technology is very suitable for abrasive and corrosive applications.