Self-priming pump and centrifugal pump is mainly the difference between a self-priming pump inlet piping does not need to install the bottom valve for the first time, after filling water diversion can suck up the water, later don't need to add water diversion, the pump body is bigger than a centrifugal pump with a lot of their own water storage function, has the function of a water diversion life-long self-priming centrifugal pump is have the effect of pressure, liquid level must be higher than the pump to liu to come in to the pump body to start, if in imports in the low level than the centrifugal pump suction pipe installation bottom valve inside the pump and the pipe filled with liquid can achieve self-priming function, or the import installation guide tank, such as pump centrifugal pump don't work for a long time, in his second start import pipeline and the inside of the pump body is basically did not have the water, and irrigation water diversion, once again more trouble on the operation, because of long time need not import bottom valve seal of centrifugal pump can't achieve the result of completely sealed liquid will slowly back to the pool of water leakage, so in need of self-priming function better condition than centrifugal pump self-priming pump.
The centrifugal pump adopts the pump body structure of axial return fluid. Centrifugal pump body by suction chamber, the liquid storage chamber, coil vortex chamber, the liquid hole, and other components of the gas-liquid separation chamber, start centrifugal pumps, the impeller of the suction chamber liquid and air suction pipe of the suction, and can completely mixed within the impeller, in under the action of centrifugal force, the liquid entrainment to vortex flow volume outside edge, this gas in the impeller outer edge is formed on a certain thickness of white foam belt and high-speed rotating liquid ring. The gas-liquid mixture enters the gas separation chamber through the diffusion tube. At this point, as the flow velocity drops suddenly, the lighter gases are separated from the mixing liquid, and the gas continues to rise through the pump. After degassing of liquid to liquid storage chamber, and the reflux hole again into the impeller, and impeller from the suction duct suction gas mixture again, under the influence of the high-speed rotating impeller, and flow to the impeller outer edge & hellip; & hellip; . As the process goes on and on, the air in the suction pipe continues to decrease until the air is sucked out and the self-priming process is completed and the centrifugal pump is put into operation. Since the centrifugal pump has this unique exhaust capacity, this self-priming pump can carry liquid containing gas, without the need to install the bottom valve, and has a good sweeping function when used on the cruise ship.
A cooling chamber is provided at the bottom of the bearing body of some centrifugal pumps. When bearing heating bearing temperature rise caused by more than 70 ℃, can be in the cooling chamber through the best a cooling fluid pipe, such as coolant injection circulating cooling. Centrifugal pump to prevent fluid from high to low pressure area before and after the leakage of sealing mechanism is sealing ring, sealing ring installed in the pump body before and after sealing ring on the bearing body, when the pump after long-term operation sealing ring wear, and affect the efficiency of the pump and self-priming performance, should be given replacement.
The centrifugal pump is driven by the motor. Before starting the pump, the pump body and the suction line are filled with liquid. When high-speed rotating impeller, the impeller blade the liquid between a rotates, due to the effect of centrifugal force, the liquid from the impeller center is flung to the impeller outer edge (flow rate can be increased to 15 ~ 25 m/s), the kinetic energy also increases. After the fluid entering the pump shell, as the flow in the volute type pump shell gradually expand, liquid velocity decreases gradually, part of the kinetic energy into static pressure can, so the liquid with high pressure along the flow discharge. At the same time, the impeller center liquid was thrown to form a certain vacuum, pressure and liquid level of Pa to be higher than the impeller center, therefore, suction pipe fluid body under the action of pressure difference into the pump. The impeller spins continuously, and the liquid is continuously inhaled and pressed out. Because centrifugal pump is able to transport liquid, mainly by centrifugal force, l is known as centrifugal pump.
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