离心泵叶轮 英文文献 5000字左右

离心泵叶轮 英文文献 5000字左右
离心泵叶轮 英文文献 5000字左右

离心泵叶轮 英文文献 5000字左右
Centrifugal is the inertia of the body, such as water droplets on the umbrella, when umbrellas slow rotation, water droplets will follow an umbrella rotation, this is because the umbrella and the centripetal force of friction as drops of water drops. But if an umbrella rotation speed up, the friction force is not enough to keep the water in circular motion, then drops out of the umbrella to the outer movements, like stones do a rope with circular motion, if the speed is too fast, rope breaks, stones will fly out. This is the so-called centrifugal.
　Basic structure of centrifugal pump is made up of six parts, namely: impeller, pump, pump shafts, bearings, sealing rings, stuffing. 1, the core part of the impellers are centrifugal pumps, its speed and high output power, impeller blades also played a major role, in front of the Assembly to pass the static balance of impeller experiment. 　　Requirement inside and outside the surface smooth of the impeller to reduce flow friction loss. 2 also known as a pump, pump body, it is the body of the pump. 　　Play a role in supporting fixed, and bays of the housings connected. 　　3, the role of pump shaft is connected take coupling and electric motor, the motor's torque to the impeller, it is the main part of transferring mechanical energy. 4, bearing is set on the pump shaft support component of the pump shaft, roller bearing and bearing two. 　　Rolling bearing using butter as a lubricant oil to appropriate for the General volume of the 2/3~3/4 too much heat, too little and the noise and fever! Use of sliding bearings are transparent oils for lubricants, refueling to the oil line. Too much oil to pump seeping loss and bleaching, accidents caused by too little bearing overheating burned again! 　　Bearing temperature in water pump is running at 85 ℃ General running at about 60 degrees, if high will find reason (whether there are impurities, oil is dark, water) and processing in a timely manner! 5, seal rings also known as a reduced ring. Clearance between the impeller inlet and pumping shells causing water pump of high pressure area in the General Assembly through this gap flow to the area of low pressure, affect the pump out of water, efficiency! Gap too small can cause friction and wear of impeller and pump shell. 　　In order to increase return resistance decrease leakage, delay the service life of impeller and pump shell, foreign aid and impeller in the pump case is equipped with sealing ring, sealing gaps remain between the 0.25~1.10MM. 6, stuffing mainly by fillers, water seal rings, packing, product packing gland, a water pipe. Stuffing box of the role is mainly to close gaps between the pump and pump axle, do not let the water flow in pump to the outside to do not let outside air into the pump. Always keep a water pump in the vacuum! When the pump shaft and packing friction generates heat by water cooling tube-sealing water injection water circle makes packing! Maintain the normal operation of the pump. So in the pump runs during the inspection tour is special attention should be paid to the stuffing box of checks! 　　Runs about 600 hours to replace the filler. 7 during the operation in centrifugal pumps, axial thrust balancing device, because the liquid is in low-voltage into the impeller, and outflow at high pressure, the pressure on both sides of the impeller, axial thrust of a link to the entry, will cause rotor axial moving, wear and vibrations, so you should set the axial thrust bearing, to balanced axial force.
The working principle of centrifugal pump is: centrifugal pump has been able to send water out is due to the effects of centrifugal force. Water pump in front of the work, of pumps and water intake pipe must be tank filled with water to form a vacuum, when the rapid rotation of the impeller, leaf water fast rotation, rotate the water flew from the impeller in centrifugal force, pump after being thrown in the water, central part of the formation of the impeller vacuum region. Sources of water in the atmospheric pressure (or pressure) through the pipe network pressure under the action of the intake tube. This loop, you can achieve continuous pumping. 　　This is worth mentioning: certain before the start of centrifugal pump to the pump after the shell is filled with water, can be started, otherwise the body will not complete the liquid absorption, cause of pump body heat, vibration, no water, "idle", damage to the pump ("gas up") creates the equipment accident.
Many types of centrifugal pump, classification methods there are several common mode 1 by inhalation of the impeller: single-suction centrifugal pumps-double-suction centrifugal pump. 2 press the number of impeller: single stage centrifugal pump of multistage centrifugal pumps. 3 press the impeller structure: closed half open impeller centrifugal pump with open impeller centrifugal pump impeller of centrifugal pump. 　　4 according to the working pressure: low pressure centrifugal pump pressure centrifugal pumps in vertical centrifugal pump of high pressure centrifugal pump. Installed in pump impeller in the shell 2, and fasten on the pump shaft 3, pump shaft driven directly by the motor. Pump suction tube and shell there is a liquid Central inhalation 4 5 connections. Liquid valve 6 and the end of the suction tube into the pump. Liquid discharge on pump shell 8 connected to the exhaust pipe 9. Before the starts of centrifugal pump, pump shell filling was transportation of liquids within; after the impeller shaft-driven high speed rotation, liquids must also as the turning of the leaves. Under the action of centrifugal force, the liquid to the outer edge and gain energy from the center of the impeller is parabolic, at high speed to leave outer edge into the snail-shaped impeller pump case. In the snail's shell, liquid slowdown due to a runner gradually expanded, and some of the kinetic energy into static pressure energy, and finally to high pressure flow into the discharge pipe, sent to the needed place. When the outer edge of the flow of liquids by the impeller Centre, forming a certain vacuum in the center of the impeller, due to the pressure of the tank above the liquid surface is larger than the entrance to the pump pressure in the liquid will be continuous pressure into the impeller. Visible, as long as the constant rotation of the impeller, the liquid will constantly be suction and discharge.
When the pump shell contains air, due to density of air is much smaller than the density of the liquid and generate less centrifugal force. Thus, the tank above the liquid surface and lack of suction pump of pressure difference at the entrance to the fluid pressure in the tank into the pump, that is, without self-absorption capacity of centrifugal pumps, centrifugal pumps cannot send the liquid, this phenomenon is called "gas up". In order to pump full of liquid, usually in the bottom of the suction pipes installed along the bottom valve strainer, the bottom valve valve, filter function is to prevent solid matter into damage or impede the normal operation of the pump impeller in the pump.
Centrifugal pumps flow components are: inhalation Chamber, impeller, press out the rooms in three parts. Impeller room is the core of pumps, are also parts of the core. Work on liquid pump by impeller, its energy increases.
Classified by direction of liquid outflow
　　According to the orientation of the liquid outflow of impeller is divided into three categories: (1) radial flow impeller (centrifugal impeller) is along the axis perpendicular to the direction of liquid outflow of impeller. 　　(2) mixed-flow impeller (mixed-flow impeller) is the direction along the axis tilt of outflow of impeller in liquid. (3) of liquid flow in axial-flow impeller direction parallel to the axis.
Classified by inhalation
　　Manner as the inhalation of the impeller is divided into two categories: (1) single-suction impeller (that is, from one side of the impeller inhalation liquids). (2) double-suction impeller (that is, from the inhalation of liquid on both sides of the impeller).
The cover forms to classify
　　Impeller cover form is divided into three categories: (1) closed impeller. 　　(2) open type impeller. 　　(3) half-open type impeller. Closed impeller with the very widely used, the preceding single-suction impeller of double-suction impeller are owned by this form.