Fuel transfer pump type
Positive displacement pumps rely on working elements in the pump cylinder reciprocating or rotary motion, the work volume alternately increase and decrease in order to achieve liquid inhalation and discharge. Suction and discharge of positive displacement pumps are closely spaced. The reciprocating motion of the working elements of the positive displacement pump called the reciprocating pump, known as rotary motion rotary pump. The former suction and discharge processes alternate within the same pump cylinder and are controlled by the suction and discharge valves (Figure 1a). The latter forces the transfer of liquid from the suction side to the discharge side by the rotation of working elements such as gears (FIG. 1b), screws, leaf rotors (FIG. 1c) or vanes. They do not require suction and discharge valves. Radial rotary piston pump (Figure 1d) and axial rotary piston pump (Figure 1e) rely on the radial and axial piston disposed on a plurality of each plunger in the rotor during the reciprocating motion in the pump cylinder To complete the suction role, they can be seen as a special type of rotary pump.
Powered pumps rely on the impellers' ability to rapidly rotate the impeller to transfer mechanical energy to the fluid to increase its kinetic energy and pressure, which in turn translates most of its kinetic energy into pressure energy through the pump cylinder. Power pump, also known as impeller pump or vane pump. Centrifugal pumps (Figure 1f) are the most common type of power pumps.
One type of pump that other types of pumps deliver energy in other ways. For example, a jet pump relies on a high-speed jet of working fluid to draw the fluid to be pumped into the pump and transfer energy by mixing the two fluids for momentum exchange. Water hammer pump is the use of water flow in the sudden brake when the energy generated, so that part of the water pressure rose to a certain height. Electromagnetic pump is the power of the liquid metal in the electromagnetic force generated by the flow and delivery. The gas lift pump delivers compressed air or other compressed gas to the bottom of the liquid through the conduit to form a lighter liquid gas-liquid mixture, which is then pressurized by the pressure of the external liquid.
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