译文:
离心泵启动时要关闭出口阀,容积泵启动时不能关闭出口阀门。
因为离心泵启动时,泵的出口管路内还没有介质,因此还不存在管路阻力和提升高度阻力,在泵启动后,泵扬程很低,流量很大,此时泵电机(轴功率)输出很大(据泵性能曲线),很容易超载而导致泵的电机及线路损坏,因此启动时必须关闭出口阀,待电机达到额定转速后,再开启出口阀门才能使泵正常运行。
而一般容积泵本身都具有自吸能力。离心泵流量随压力改变很大,而容积泵流量随压力改变却很小,与离心泵的轴功率随扬程提高而减小的规律相反,容积泵的轴功率随压力的提高而增大。这要求在容积泵上和泵装置中必须设备安全阀,以防排出管路意外堵塞,造成泵压力过大,从而功率过大,使原动机或泵因超负荷而损坏。因此,容积泵启动时不能关闭出口阀门,直接启动即可正常运行。
“ Pump starts, export or not to close the valve”是由提供的国际阀门新闻,译文仅供参考。另外,中国球阀网还提供相关产品搜索:、、、、等。
原文:
Centrifugal pump starts to close outlet valve, volumetric pump
start valve does not shut down exports. Because the pump is
started, the pump is still no media export pipeline, the pipeline
does not yet exist a high degree of resistance and to enhance
resistance, the pump starts, pump head is low, flow great, this
time pump motor (shaft power) Output large (according to the pump
performance curve), it is easy to overload caused by damage to the
pump motor and wiring, so start the export valve must be closed
until after the motor to achieve rated speed, and then open the
outlet valve to the pump running. The general displacement pump itself has a self-priming capability. Centrifugal
pump flow rate as a pressure change much, while the volume of pump
flow rate as a pressure change was small, and the centrifugal pump
shaft power decreases with the head of the law to improve the
contrary, the volume of the pump shaft power with the pressure
increase and increase. This requires a volume pump and pump
installations in the necessary equipment safety valve to prevent accidental
discharge pipe blockage, resulting in pump pressure is too large,
and thus power is too large, so that the prime mover or pump damage
due to overload. Therefore, the volume of exports can not be closed
when the pump starts valves, normal operation can be started
directly.
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