Equipment maintenance directory, pump gas purification (a), definition and classification of the pump (two), treatment plants use pump structure, working principle, maintenance and the common faults of centrifugal pump reciprocating pump metering pump, 5 screw pump, gear pump
(three), pump daily maintenance and repair program (a), the definition and classification of the pump, the pump is the original motive of the mechanical energy is converted to liquid energy machine. The original motivation (motor, diesel engine etc.) drives the impeller to rotate through shaft, to do work on liquid, so the energy (including potential energy, pressure energy and kinetic energy) increases, so that the liquid delivery requirements to high pressure or place. • pump is a kind of general machinery important, products are widely used in industry, agriculture. Industry is mainly applied to the field of thermal power, nuclear power, petroleum, petrochemical, city water supply, environmental protection etc.. In many species, pump, classification method, it also each are not identical, according to its working principle can be divided into three categories: vane type pump, positive displacement pumps, other types of pumps. We now according to the structure, medium, use comprehensive classification, see table
(two), treatment plants use pump structure, working principle, maintenance and common fault • 1, centrifugal pump centrifugal pump is the basic structure composed of six parts are the impeller, pump body, pump shaft, bearings, seal rings, stuffing box. Impeller centrifugal pump is the core part, its higher speed, the impeller blades and played a major role in the assembly before, the impeller through the static equilibrium experiments. Internal and external surface of impeller on the requirements of smooth, to reduce the flow friction loss. Also known as pump pump shell, which is the main water pump. Play a role in supporting fixed, and is connected with the installation of the bearing bracket. The role of pump shaft coupling and motor by connecting, the motor torque to the impeller, it is the transmission of mechanical energy of the main components. Is a set of bearings component on the support shaft in the shaft, a rolling bearing and sliding bearing two. Rolling the use of butter as a lubricant oil to be appropriate is 2/3 3/4 size too much may have a fever, and too little heat and noise! Sliding bearings using a transparent oil as lubricant, fuel to the oil level line. Too much oil to be leaking along the shaft and drift of base, too little overheated bearings burned to the accident! Bearing in the pump during operation the maximum temperature of 85 degrees in the general run of about 60 degrees, if we should find the reasons for higher (whether there are impurities, oil is black, is water) and timely treatment.
Also known as reduced leakage sealing ring ring. Impeller and pump shell gap between the pump pressure will cause the water flow through the gap area of low pressure water pump, effect, efficiency! The gap is too small will cause the impeller and the pump shell friction and wear. In order to increase the return to reduce the internal leakage resistance, the service life of delaying the impeller and the pump shell, junction with sealing ring in the pump impeller shell edge and foreign aid, sealing the gap remained at between 0.25 ~ 1.10mm is appropriate. Stuffing mainly by the packing, seal ring, tube filler, filler cap, seal tubes. Fill the role of letter is to close the gap between the pump shell and a pump shaft, not to pump the water flow out to not let the outside air into the pump. Always maintain the vacuum pump! When the pump shaft and the packing heat friction depends on the water pipe on the living water to fill the cooling water sealed circle! To maintain the normal operation of pumps. So in the operation process of pump in the inspection tour of inspection of the stuffing is the special attention should be paid to! On the packing should be replaced in about 600 hours to run
Centrifugal pump working principle: when the centrifugal pump, pump shaft to drive the impeller to rotate quickly, forcing the pre filling rotating liquid in leaves, in the inertial centrifugal force, the liquid from the impeller center outward radial motion. Liquid obtained energy during the motion process flows through the impeller, pressure can increase, the increase of flow rate. When the liquid from the impeller to enter the pump shell, and deceleration due to shell channel expands gradually, part of kinetic energy into pressure energy, the final discharge pipe along a tangential flow. So the volute is not only from the impeller outflow liquid components, but also a turning device. When the liquid from the impeller center swing outward to form a low pressure area, the center of the impeller, the total potential energy surface and the center of the impeller tank under the difference, thus the liquid is sucked into the center of the impeller. Relying on the continuous running impeller, the liquid will be continuously suction and discharge. The mechanical energy of liquid in the centrifugal pump performance for the ultimate pressure can improve.
It should be stressed that, if the pump before the start should be filled with liquid to be delivered to the pump shell, because the air density is low, the centrifugal force produced by the rotation of the impeller, the impeller center area is not enough to form a suction pressure liquid storage tank, so although the centrifugal pump can not transport liquid. This shows that the non self priming centrifugal pump, this phenomenon is called gas. Suction piping installation check valve is to prevent before the start into the pump shell liquid flows out from the shell. Air from the suction pipe to cause gas tied all the pump casing. 望采纳！！！
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