Pipeline centrifugal pump basic knowledge

Centrifugal pump so water can be sent out due to the role of centrifugal force. Pump before work, the pump body and the inlet pipe must be filled with water to form a vacuum state, when the impeller rotates quickly, the blade to promote rapid rotation of water, rotating water from the impeller in the centrifugal force of the fly, the pump of water After being thrown, the central part of the impeller forms a vacuum area. Suwon's water pressure in the air pressure (or water pressure) under pressure through the pipe into the water pipe. This endless cycle, you can achieve continuous pumping. It is worth mentioning that: before starting the pump must be filled with water to the pump casing before starting, otherwise it will cause the pump body heat, vibration, reduce the amount of water, causing damage to the pump (referred to as "cavitation") Cause equipment accident! Many types of centrifugal pumps, classification methods are common in the following ways: 1 by the impeller inhalation points: single suction centrifugal pump double suction centrifugal pump. 2 according to the number of impeller points: single-stage centrifugal pump, multistage centrifugal pump. 3 according to the structure of the impeller: open impeller centrifugal pump semi-open impeller centrifugal pump closed impeller centrifugal pump. 4 according to the working pressure points: low pressure centrifugal pump medium pressure centrifugal pump high pressure centrifugal pump side vertical centrifugal pump. The basic structure of pipeline centrifugal pump is composed of motor, pump body, pump cover, pump shaft, impeller and mechanical seal. Motor: a single-phase, three-phase, explosion-proof, and the specific voltage and frequency of the motor. The general direction of rotation are clockwise. Motor power to the size of the pump to match, in order to achieve the pump rated coefficient requirements, the motor is not easy to burn machine. Explosion-proof motor is used in a flammable and explosive environment. Pump body: support from the fixed role, and with the bearing bracket is connected. Pump cover: Shell at both ends of the pipe section. Impeller: Centrifugal pump is the core part of its speed higher than the large impeller blades play a major role in the impeller before the static balance through the experiment. The inner and outer surfaces of the impeller require smoothness to reduce the frictional loss of water flow. Due to prolonged operation, and the fluid medium with hard solid particles, the operation of friction with the impeller, so the impeller will wear, will lead to the efficiency of the pump. Mechanical seal: spring seat sleeve on the shaft. The rubber seat is embedded in the center of the pump body and the shaft of the pump. The sealing function is to change the original friction between the shaft and the sealing ring in the shaft seal into a sliding friction between the spring seat sleeve and the rubber seat. Fluid medium (water) at the same time from the role of lubrication, the use of pumps to prohibit water-free operation, is to protect the mechanical seal requirements, pump leakage is an important reason for the mechanical seal wear.

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