译高压往复泵的特点外文翻译@中英文翻译@外文文献翻译

1 外文资料 High-handed intercourse pump characteristic High pressure between 100 MPa moving back and forth responding to like pump sigmatism pressure in 10 MPa . It belongs to volume dyadic pump , the purpose drawing support from volume inside the cavity working coming to reach transportation liquid cyclicity change； The prime mover mechanical energy can by that the pump changes into the pressure transporting liquids directly； Only, the pump capacities depend on job cavity volume changing value and their change number of times within unit time , have nothing to do with to discharging pressure theoretically. The pump moving back and forth is to be backed by the piston advance and return movement within liquid jar job cavity (or passing the flexibility component cyclicity within the cavity working such as baffle , bellows makes job cavity volume produce cyclicity changes coming elastic-deformation). Pump on structure, moving back and forth, Whose characteristic is summed up as follows: Microtime rate of flow is systolic. This is in the pump because of being moving back and forth, and liquid medium sucking in discharging process being to be in progress alternately, and the piston cant be in field change ceaseless in displacement process middle , whose speed among. In the pump only having a cavity working, not only the pump microtime rate of flow vary with with time, and be discontinuous. With job cavity increasing by, microtime rate of flow pulsation extent is more and more small, and even pragmatic upper not bad regard as to stabilize a stream. Average rate of flow is constant Theoretically, the pump rate of flow depends on main pump structure physics , chemical property independences such as parameter n (every minute intercourse number of times) , S (piston travel) , D (piston diameter) , Z (piston number) , the temperature , viscosity with the independence discharging pressure, and 2 with transporting medium only. Therefore saying a pumps, rate of flow is constant. The pump pressure depends on pipeline characteristic property Unable pressure been to depend on a pump unit because the pump sets a limit for per se, pipeline characteristic property, has nothing to do with rate of flow pump snapout moving back and forth moreover. Just say, if thinking that transporting liquid is incompressible,in terms of theory think that pump moving back and forths discharge pressure will not accept any restricting , be OK to discharge pressure according to the pump unit pipeline characteristic property , the what any needs building a pump. The capital of pump moving back and forth natural , all the regulation discharging pressures having a pump , this is not that pressure can not rise again, but say only because of prime mover fixed power and the pump saying the snapout that a pump self structure intensity restricting, do not allow being put into use under exceeding this once discharging pressure but self own. Have stronger adaptability to transporting medium The pump moving back and forth can transport any medium , physics function and chemistry function restricting hardly accepting medium in principle. Certainly, since hydraulic whole course of restricts as well as material and the manufacturing engineering sealing off a technologys, also may come across the condition being able to not fit in with sometimes. Have fine self attracts a function. The pump moving back and forth has fine sucking in not only function, and there are still fine self attracts a function. Have no need of irrigation pump therefore , to the pump moving back and forth most, generally before starting. Machine efficiency height , energy conservation. High-handed intercourse pump rate of flow The pump theory rate of flow: Qt = AsnZ Style is hit by Qt pump theory rate of flow； A bar piston (or section of piston) 3 area； S route or distance of travel； The n crank shaft rotation rate (or the bar piston every minute intercourse number of times) Z unites a number (bar piston or piston number) Actual pump rate of flow: Q = Qt Q. Style is hit by Q pump rate of flow； Qt pump theory rate of flow； The pump rate of flow loses Q. The factor that the rate of flow bringing about a pump loses has: The volume bringing about since liquid compresses or expands is lost； The volume bringing about since the valve lags when being closed down is lost； Since the valve closes the day afer tomorrow do not lose strictly, by sealing off the volume that leakage soft and floury brings about； The volume by the fact that the bar piston , piston rod or the piston ring leakage bring about is lost. The pump microtime rate of flow Single cylinder Shan effect pump rate of flow curve: Qt Three jar Shan effects pumps rate of flow is the single cylinder Shan effect pump rate of flow overlying on three phases 4 Whose curve as follows: Qt The pump power The pump effective power: The energy that the inner , the liquid being discharged by the pump gain time the unit from the pump is called an effective power. Ne PQ In style, the Ne effective power , P satisfy pressure , Q rate of flow Unit queen formula becomes substitution: Ne(KW) 1/36.7P(Kgf/cm2)Q(m3/h) 。 The power thinking that the temperature rises to actuator efficiency , machinery friction , volumetric efficiency , medium waiting for cause to bring about loses , chooses the pump moving back and forth when prime mover power, to low pressure, N 1/(0.850.9)N； To high-handed the pump moving back and forth , N = 1/ (0.75 0.85) N. The pump application range moving back and forth The pump moving back and forth applies to high-handed small rate of flow mainly , requires that the pump rate of flow is constant or the quantify , proportionality transport various different medium , demands occasion to suck a function in well, or demands to there is self attracting a functions or. Under in the nowadays world sources of energy is short-supplied circumstances, the pump moving back and forth is the energy conservation product, the mine 5 has exploited , petroleum has got in a lot of industry such as fine chemicals , food medicines and chemical reagents treating broad usage in the sources of energy. This kind of pump structure is comparatively complicated , forming a complete set is strong but General Availability is bad, the breed is many but batches are small. 6 中文翻译 高压往复泵的特点 高压往复泵的使用压力一般应在 10MPa 100MPa 之间。它属于容积式泵，借助工作腔里的容积周期性变化来达到输送液体的目的；原动机的机械能经泵直接转化为输送液体的压力能；泵的容量只取决于工作腔容积变化值及其在单位时间内的变化次数，理论上与排出压力无关。往复泵是借助于活塞在液缸工作腔内的往复运动（或通过隔膜、波纹管等挠性元件在工作腔内的周期性弹性变形）来使工作腔容积产生周期性变化的。在结构上，往复泵的工作腔是借助密封装置与外界隔开，通过泵阀（吸入阀和排出阀 ）与管路沟通或闭合。其特点归纳如下： 瞬时流量是脉动的 这是因为在往复泵中，液体介质的吸入和排出过程是交替进行的，而且活塞在位移过程 中，其速度又在不断地变化之中。在只有一个工作腔的泵中，泵的瞬时流量不仅随时间而变化，而且是不连续的。随着工作腔的增多，瞬时流量的脉动幅度越来越小，乃至在实用上可以认为是稳定流。 平均流量是恒定的 理论上，泵的流量只取决于泵的主要结构参数 n（每分钟往复次数）、 S（活塞行程）、 D（活塞直径）、 Z（活塞数目），与排出压力无关，且与输送介质的温度、粘 度等物理、化学性质无关。所以说泵的流量是恒定的。 泵的压力取决于管道特性 往复泵的排出压力不能由泵本身限定，而是取决于泵装置的管道特性，并且与流量无关。 也就是说，如果认为输送液体是不可压缩的，那么，在理论上可认为往复泵的排出压力将不受任何限制，即可根据泵装置的管道特性，建立泵的任何所需的排出压力。当然，所有往复泵都有一个泵的排出压力的规定，这不是说该泵的排出压力不会再升高，而只是说，由于原动机额定功率和泵本身的结构强度的限制，不允许在超出这一排出压力下使用而己。 对输送介质有较强的适应性 往复泵原则上可以输送任何介质，几乎不受介质的物理性