The ZX self-priming pump motor obtains energy from the power supply, drives the ZX self-priming pump to run, and works under certain external environment and conditions at the same time. Therefore, the choice of motor should handle the relationship between the motor and the stainless steel submerged pump, the motor and the working environment; and try to achieve less investment, simple equipment, safe operation, and convenient management.
Motor types and characteristics In water supply and drainage pumping stations, commonly used asynchronous motors are squirrel cage type and winding type. A squirrel-cage motor has knots.
It has the advantages of simple structure, reliable operation, high efficiency, low price, and easy realization of automatic control and remote control; the disadvantage is that the starting current is large. However, since the centrifugal pump is started with a light load, the required starting torque is small, which can generally meet the requirements; as long as the axial flow pump is started with a load, the starting torque can also meet the requirements. Therefore, when selecting an asynchronous motor, the Y series mouse:cage asynchronous motor is generally preferred. This series is an updated product of the J and JO series motors. It has high efficiency, large starting torque, low noise, and good protection performance. And other advantages, only when the power supply capacity cannot meet the starting requirements, the starting torque is large and the power is large, the winding type asynchronous motor is selected.
Synchronous motors are expensive, and equipment maintenance and start-up are complicated; but the power factor and efficiency are high. Generally, large-scale units with a stand-alone power above 300kW use synchronous motors.
For non-humid and dust-free ground water pumping stations, general protective motors can be selected. For wet and dripping underground water intake pumping stations, enclosed fan-cooled motors should be used.
Determination of motor power: when the motor and water pump are not supplied as a set. According to the calculated N distribution and the rated speed of the water pump, the specification and model of the motor can be selected on the motor catalog.
Thermal cracking: If the sealing surface of ZX self-priming pump is in dry friction, cooling is suddenly interrupted, impurities enter the sealing surface, evacuation, etc., it will cause radial ripples on the surface of the ring, which will cause rapid wear of the sealing ring and rapid increase in leakage of the sealing surface. Hot cracking of tungsten carbide rings is more common.
Foaming and carbonization. If the graphite ring exceeds the allowable temperature during use, resin will precipitate on the surface, and the resin near the friction surface will be carbonized. When there is a binder, it will foam and soften, which will increase the leakage of the sealing surface and cause the seal to fail. .
Aging, cracking, and swelling If the rubber continues to be used beyond the allowable temperature, it will rapidly age, crack, harden and lose its elasticity. If it is an organic medium, the swelling will be disselected, which will cause the seal to fail.
If the seal fails due to heat loss, the key is to reduce frictional heat as much as possible, improve heat dissipation, and prevent drastic temperature changes at the sealing surface. Large, solid R particles entering the sealing surface, etc. will cause the sealing surface to wear too fast and cause the seal to fail. The balanced mechanical seal is used to reduce the specific pressure and the spring pressure is appropriately reduced during installation, which is beneficial to overcome the failure caused by wear. In addition, choosing a good friction material can reduce wear. According to the order of wear resistance, the materials are arranged as silicon carbide-carbon graphite, cemented carbide-carbon graphite, ceramics, carbon graphite, sprayed ceramics-carbon graphite, silicon nitride ceramics + carbon graphite, high-speed steel-carbon graphite, surfacing cemented carbide - carbon stone.
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