1、 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 cy
2、clicity 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 the
3、oretically. 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-deform
4、ation). 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
5、 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,
6、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 (pis
7、ton diameter) , Z (piston number) , the temperature , viscosity with the independence discharging pressure, and with transporting medium only. Therefore saying a pumps, rate of flow is constant. The pump pressure depends on pipeline characteristic property 2 Unable pressure been to depend on a pump
8、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 press
9、ure 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 c
10、an 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
11、 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 c
12、ondition 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
13、 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) area； S route or distance of travel； The n crank shaft rotation rate (
14、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. 3 The factor that the rate of flow bringing about a pump lo
15、ses 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 vo
16、lume 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 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.
