Centrifugal Pump, Mixed Flow Pump and Axial Flow Pump

Centrifugal pumps, mixed-flow pumps and axial flow pump is the same principle for the water, the three is a common situation between the very much. They are by the rotation of the impeller to the water pressure and speed and other two kinds of energy, when it passes through the pump, as far as possible the high efficiency of the kinetic energy into pressure energy, so that from low to high (or from low pressure to high pressure Area) water. Today, in Japan there is no such name as the three pumps. This name is not suitable for this, but also with the "5 rolls of elves" (centrifugal pump) for synonyms to understand. In foreign countries, the name used is nonvolatile pump Non PositiveDisplacement Pump (US) or turbo pump (UK). The former is to take the reciprocating pump and the rotor pump together known as the positive displacement pump (Positive Displacement Pump) the opposite of a name.
Centrifugal pump is the use of impeller rotation to make the water centrifugal movement to work. Before the start of the pump, the pump casing and the suction pipe must be filled with water, and then start the motor, so that the pump shaft to drive the impeller and water to do high-speed rotary motion, water centrifugal movement, was thrown to the outer edge of the impeller, Road into the water pump of the water pipe.
The basic structure of the centrifugal pump is composed of eight parts, namely: impeller, pump, pump cover, retaining ring, pump shaft, bearing, seal ring, stuffing box, axial force balance device.
1, the impeller is the core part of the centrifugal pump, it is high output speed.
2, the pump also known as pump shell, it is the main pump. To support the fixed role, and with the installation of the bearing bracket connected.
3, the role of the pump shaft is connected by the coupling and the motor, the motor torque to the impeller, so it is the main part of the transmission of mechanical energy
4, seal ring, also known as leakage ring.
5, packing material mainly by the filler, not to pump the water flow to the outside to not let the outside air into the pump. Always keep the vacuum inside the pump! When the pump shaft and filler friction to produce heat is necessary to rely on water sealed tube water seal to fill the filler!
6, the axial force balance device, in the centrifugal pump running process, because the liquid is under low pressure into the impeller, and in the high pressure outflow, so that the pressure on both sides of the impeller, resulting in the direction of the axial direction of the thrust, Will cause the rotor to occur axial movement, resulting in wear and vibration, it should be set to axial thrust bearings in order to balance the axial force.
The mixed-flow pump is a "pull-out" type structure pump that does not need to be disconnected from the pump connection when inspecting and removing the impeller and shaft seal. Equipped with precision machining of the pump shaft and bearing with thin oil lubrication, in the stuffing box cover with protective sleeve. The oil level of the bearing housing can be controlled by a constant oil cup.
The feet of the pump body can withstand any load from the pipe and are delivered directly to the foundation. In this way, the rotor will not be bent due to the load of the pump, so as to ensure the best service life of the bearing.
Axial pump by the rotation of the impeller blade on the liquid generated by the force of the liquid along the axis of the pump, vertical, horizontal, inclined and cross-flow of several.
Axial pump impeller with 2 to 7 blades, rotating in a round tubular casing. The upper part of the impeller is fitted with a fixed guide vane to eliminate the rotational motion of the liquid, to make it into axial motion, and to convert the kinetic energy of the rotary motion into pressure energy. Axial flow pumps are usually single-stage, a few made of two-stage. Flow range is very large, 180 to 360 million cubic meters / hour; head generally 20 meters below. Axial pumps are generally vertical, impeller submerged in the water, there are horizontal or inclined axial flow pump.
Three types of pumps to get the pressure of the method are different, centrifugal pump is the role of centrifugal force to make water pressure, axial flow pump is the water supply by the blade to produce pressure. While the mixed flow pump is part of the centrifugal force, and the other part of the lift by the blade to get water pressure.