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1、教学单位 宝鸡文理学院 学生学号 200894014098 编 号 JD2012JZ4098 外文翻译题目 离心泵 学生姓名 冯涛 专业名称 机械设计制造及其自动化指导教师 史革盟 2012 年5月18日Centrifugal pumpThe concept of centrifugalCentrifugal inertia is the performance of an object, such as umbrellas on the water droplets, when the umbrella slowly rotating, the water droplets will fol
2、low the umbrella rotation, because the umbrella and the friction of water droplets to drop as the centripetal force of shiran. However, if the umbrella rotation speed, the friction enough to make water droplets in a circular motion, then drop the sport from the umbrella to the outer edge, like a rop
3、e pulling the stones to do with circular motion, if the speed is too fast, the rope will disconnect, stones will be flying out. This is the so-called centrifugal.Centrifugal pump is designed according to this theory, high-speed rotation of the impeller blades rotate driven water, throw water, so as
4、to achieve the purpose of transportation.Good variety of centrifugal pumps, from the use can be divided into civil and industrial pumps; from the transmission medium can be divided into clear water pump, trash pump, corrosion pump and so on. Basic structure centrifugal pumpBasic structure of the cen
5、trifugal pump is composed of six parts, namely: impeller, shaft, bearings, seal rings, stuffing box.1 centrifugal impeller is a core component of its speed and high output force, the impeller blade has played a major role in the assembly before the impeller by static test. Impeller on the inside and
6、 outside surfaces required to be smooth to reduce flow friction loss.2, pump, also known as the pump casing, which is the main water pump. Play a role in supporting fixed, and with the installation of the bearing bracket connected.3, pump shaft and motor function is connected by coupling, the motor
7、torque transmission impeller, it is the transfer of mechanical energy of the main components.4, the bearing is set on the support shaft in the shaft component, there are two kinds of rolling bearings and plain bearings. Rolling to use butter as lubricant oil to be appropriate is 2 / 3 3 / 4 size too
8、 much may have a fever, there are too few sound and heat! Pump bearing structure is transparent to the oil used for lubricants, fuel to the oil level line. Too much oil to be leaking along the shaft and drift *, too little overheated bearings and also burn the accident! Bearing in the pump during op
9、eration the maximum temperature of 85 in the general run of 60 degrees, if we should find out the reasons high (whether impurities, oil is black, is water) and timely manner5, sealing ring, also known as leakage reduction ring. Impeller and pump casing of imports over the gap between high-pressure a
10、reas cause the pumps water flow through the gap area of low pressure affecting the pump out water, reducing efficiency! Gap is too small will cause the impeller and pump casing friction and wear. In order to increase the return to reduce the internal leakage resistance and delay of the impeller and
11、pump casing life of the pump impeller shell edge and foreign aid junction with sealing ring, sealing the gap remained at 0.25 1.10mm hydrometer.6, stuffing mainly by the packing, seal ring, filler tube, packing gland, seal tubes. The main function of stuffing is to be closed between the pump casing
12、and shaft gap, not to pump the water does not flow out to not let outside air into the pump. Always maintain the vacuum inside the pump! When the pump and fill the water seal friction depends on the heat pipe to live on the water to seal circle to fill the cooling! To maintain the normal operation o
13、f pumps. So check the pump to run during the tour of inspection of the stuffing is the special attention! About running 600 hours on the packing should be replaced.The working principle of centrifugal pumpImpeller installed inside the pump casing 2 and fastened in the shaft 3, the shaft directly dri
14、ven by the motor. Central has a liquid pump casing and suction pipe inhaling 4 5 connection. Liquid through the bottom valve 6 and the suction tube into the pump. Pump casing liquid discharge outlet on the discharge pipe 8 and 9 connections. Before starting the pump, the pump is transported shell fi
15、lled with liquid; starts, starts, the impeller shaft driven by the high-speed rotation, the liquid between the blades must rotate with. Under the action of centrifugal force, the liquid was thrown from the center of the outer edge of the impeller and get energy from the impeller at high speed into t
16、he volute pump outer shell. In the spiral case, the fluid flow, gradually as the expansion slowed down in turn part of the kinetic energy into static pressure energy, the final discharge at higher pressure into the pipeline, sent to the need to place. The flow of liquid from the center of the outer
17、edge of the impeller when the impeller center in the formation of a certain vacuum, due to the pressure tank above the liquid level is greater than the pressure at the entrance to the pump, the liquid will be pressed into the impeller in a row. Can be seen, as long as the constantly rotating impelle
18、r, the liquid will continue to be sucked and discharged.The phenomenon of gas tieWhen the pump casing to the existence of air, because air density is much smaller than the density of the liquid caused by a smaller centrifugal force. Thus, the tank liquid level above the entrance and the pressure dif
19、ference between pump sufficient fluid pressure within the tank into the pump, that is not self-priming centrifugal pump, so pump can not transport liquid, such phenomenon is known as gas tie phenomenon. In order to pump full of liquid, usually installed in the suction pipe along the bottom of the bo
20、ttom filter valve, the bottom valve until the valve, the filter is to prevent solid material into the pump impeller damage or impede the normal operation of the pump.The main components of centrifugal pumpMain components are impeller, pump casing and shaft seal devices.1 impellerThe role of the impe
21、ller is the original motivation of the mechanical energy directly to the liquid, to increase the liquid static pressure energy and kinetic energy to the major increase in static pressure.Impeller are generally 6 to 12 after the curved blade.Impeller are open, semiclosed-type and closed three, as sho
22、wn in Figure 2-2. Both sides of the blade open impeller without cover, create a simple, easy to clean, suitable for transmission over a large number of suspensions containing materials, inefficient delivery of the liquid pressure is not high; semi-enclosed impeller in the suction side of the non-cov
23、er board, while the other side of cover, precipitation, or easily applicable to transport materials containing particles, and lower efficiency; closed impeller, the impeller blades on both sides of the front cover with high efficiency, suitable for delivery without impurities cleaning liquid. Multi-
24、impeller centrifugal pumps in general for such.Impeller with a single suction and double suction two suction fluid ways.There is a single suction inlet, along with water from both sides for double suction.2 pump shellRole is to impeller enclosed in a certain space for the role by the impeller and th
25、e pressure of the fluid inhalation. Multi-spiral-shaped shell made of the pump, so called spiral. As the flow cross-sectional area gradually expanded to throw it around from the impeller speed liquid flow rate decreases, so that part of the kinetic energy is converted to static pressure can be effec
26、tive. Together not only by the impeller pump casing throw the liquid, is also an energy conversion device.3 seal deviceRole is to prevent the pump shell along the axis of liquid leakage or air leakage into the pump outside the containment.Common seal device has two kinds of packing seal and mechanic
27、al seal.General packing coated with oil or graphite Baptist asbestos rope. Mainly by mechanical seal is mounted on the shaft of the ring and fixed on the pump casing static ring relative motion between the end face for the purpose to achieve the seal.Centrifugal flow passage componentsCentrifugal fl
28、ow passage components are: inhalation chamber, impeller, a chamber pressure of three parts. Is the core of the pump impeller chamber, is also part of the core flow. Pump liquid through the impeller on the Power, to increase the energy. Impeller according to the direction of liquid flow is divided in
29、to three categories:(1) run-of impeller (centrifugal impeller) and the liquid along the axis perpendicular to the direction of flow impeller.(2) oblique flow impeller (mixed flow impeller) of liquid along the axis tilt of the direction of flow impeller.(3) liquid axial flow impeller and the axis par
30、allel to the direction.Impeller by way of inhalation is divided into two categories:(1) single-suction impeller (the impeller from the suction side of the liquid).(2) double suction impeller (the impeller from both sides of inhalation liquid).Divided into three categories according to the form of im
31、peller cover:(1) closed impeller.(2) open impeller.(3) semi-open impeller.Closed impeller which is widely used, the aforementioned single-suction impeller double suction impeller belong to this form.Type of centrifugal pumpFrist. and, according to the number of categories impeller1, single-stage pum
32、p: that is, only one pump impeller.2, multi-stage pump.: In shaft with two or more of the impeller, when the total pump head for the n-of impeller and the resulting head.Second, according to classification of work stress1, low-pressure pump: pressure less than 100 m water column;2, medium pressure p
33、umps: pressure is between 100 to 650 m water column;3, high-pressure pump: the water column pressure is higher than 650 meters.Third, by way of classification of the impeller inlet1, side water pump: also known as single-suction pump, which the impeller is only one intake;2, bilateral water pump: al
34、so known as double suction pump, which the impeller has an inlet on both sides. Its single suction pump flow ratio doubled in size, can be approximately regarded as two single-suction impeller placed together back to back.Fourth, according to the form of pump casing combined with joint classificatio
35、n1, horizontal split pumps: the line in the horizontal plane through the center of a combination of open seam.2, the vertically integrated surface pumps: the combination of surface and perpendicular to the axis line.Fifth, according to shaft position to Category1, horizontal pump: pump in the horizo
36、ntal position.2, vertical pump: pump in the vertical position.Sixth, according to the impeller out of the water pressure out of room to lead the way classification1, volute pumps: water from the impeller out, directly into a spiral shape of the pump shell.2, guide vane pump: water came out from the
37、impeller into the diffuser set it outside, and then proceed to the next level or into the outlet tube.Usually we say that a multi-stage pumps are pumps, impeller means in terms of how much. According to other structural features, which there may be horizontal pumps, vertical integration surface pump
38、s, guide vane pumps, high pressure pump, water pump and so on one side. So according to different, it is called not the same. Also, according to use can also be classified as oil pump, water pump, condensate pump, ash pump, circulating water pumps, etc.Classification of the characteristics of centri
39、fugal typeBy inhalation of a single suction pump means flow of liquid from the side of the impeller, there is the axial forceDouble suction pump liquid into the impeller from both sides, there is no axial force, the flow rate is almost double than single-suction pumpsSeries single-stage pump accordi
40、ng to only one impeller shaftMulti-stage pump with a pump to upload two or more impellers, the liquid flow through each impeller in turn, more series, the higher liftHorizontal shaft by horizontal shaft orientationVertical shaft perpendicular to the horizontal planBy housing type pump housing by sub
41、-vertical plane with the shaft portion between the segments and segment connections with long boltsOpen-pump in the shell line in the plane through the center of SplitSpiral volute pump with pressurized water pump room, such as the common end-suction cantilever centrifugal pumpTurbine guide vane pum
42、p with pressurized water chamber of the pumpSpecial StructurePipeline pumps as part of pipeline, pipeline installation, no need to changeSubmersible pumps and motors made of one immersed in waterImmersed in liquid pump liquid pumpsShielding pump impeller and the motor rotor together as one and the s
43、ame within a sealed shell without fully sealed, leak-free pumps areIn addition to magnetic pump inlet and outlet, the pump fully closed, the pump and motor coupling magnets can attract each other and driven bySpecial StructurePipeline pumps as part of pipeline, pipeline installation, no need to chan
44、geSubmersible pumps and motors made of one immersed in waterImmersed in liquid pump liquid pumpsShielding pump impeller and the motor rotor together as one and the same within a sealed shell without fully sealed, leak-free pumps areIn addition to magnetic pump inlet and outlet, the pump fully closed
45、, the pump and motor coupling magnets can attract each other and driven bySelf-priming pumps do not start filling liquidHigh-speed pump from the tank to pump speed to increase the growth rate, the general speed up 10000r/min above can also be called part of the tangential flow pump or booster pumpVe
46、rtical Barrel Pump imports and exports over the same height in the upper part, there inside and outside the two-shell, internal shell from the rotor, stator, etc. component, shell body for the import diversion channel, the liquid from the lower part of inhalationMany different types of centrifugal p
47、ump, a common classification of the following ways1, by way of sub-suction impeller: single suction centrifugal double suction centrifugal pump;2, the number of points by the impeller: a single-stage centrifugal multi-stage centrifugal pump;3 points by impeller structure: semi-open impeller centrifu
48、gal pumps with open impeller centrifugal pump closed impeller centrifugal pump;4 points by working pressure: low pressure centrifugal pump in high-pressure centrifugal pump;5 points by shaft position: horizontal centrifugal side of vertical centrifugal pumps.SG life to pumps, pump life, residential water pumps, life, water supply and drainage equipment, according to IS, IR-based performance parameters and vertical centrifugal pumps unique combination of design structure, and in strict a