火箭推进

介绍了离心泵泵压加注系统组成和工作原理,通过计算离心泵和泵压加注系统的扬程,得到扬程与流量关系式,绘制离心泵扬程与流量特性曲线和泵压系统扬程曲线,由两条曲线相交确定离心泵工作点。然后绘制泵压加注系统在管路流阻、容器液位动态变化情况下离心泵工作点的变化曲线,分别和离心泵扬程与流量特性曲线相交,分析曲线图上不同流阻、液位下的离心泵工作点,得出导致离心泵偏离正常工作点的主要因素。理论分析结果经验证与泵压加注系统实际运行结果基本一致。依据分析结果,制定了针对性的控制措施,达到提高离心泵加注系统的工作可靠性的目的。

This paper briefly introduces working principle and system composition of pumping pressure filling system for the centrifugal pump.By calculating the lift of centrifugal pump and pumping pressure filling system, the relationship between fiow and lift is obtained.The characteristic curves of lift and flow of centrifugal pump as well as the lift curve of pumping pressure filling system are drawn, in which the working point of centrifugal pump is determined by the intersection of both curves.Then, the variation curve of the operating point of centrifugal pump is drawn under the dynamic change of fluid resistance in pipeline and the liquid level in container, which intersects with the lift and flow characteristic curves of the centrifugal pump respectively.By analyzing the working point of centrifugal pump at different fluid resistances and liquid levels, major factors that cause the centrifugal pump to deviate from the normal working point are obtained.It is verfied that the theoretical analysis results are basically consistent with the actual operating results of the pumping pressure filling system.According to the analysis results, the specific control measures are formulated to improve the reliability of filling system for centrifugal pump.

引言
1 离心泵加注系统简介
2 离心泵的工作特性
3 离心泵加注系统工作特性
4 离心泵加注系统工作点的确认
5 影响离心泵加注系统工作可靠性的因素分析
6 提高可靠性控制措施
7 应用分析
8 结论

图1 离心泵加注系统示意图<br/>Fig.1 Schematic diagram of the filling system of centrifugal pump

图1 离心泵加注系统示意图
Fig.1 Schematic diagram of the filling system of centrifugal pump

图2 离心泵的扬程与流量特性曲线<br/>Fig.2 Lift and flow characteristic curve of centrifugal pump

图2 离心泵的扬程与流量特性曲线
Fig.2 Lift and flow characteristic curve of centrifugal pump

图3 泵压加注系统扬程(Hp-Q)特性曲线<br/>Fig.3 Lift and flow characteristic curve of the pump pressure filling system(Hp-Q)

图3 泵压加注系统扬程(Hp-Q)特性曲线
Fig.3 Lift and flow characteristic curve of the pump pressure filling system(Hp-Q)

图4 泵压加注系统工作点确认示意图<br/>Fig.4 Confirmation diagram of working point for pump pressure filling system

图4 泵压加注系统工作点确认示意图
Fig.4 Confirmation diagram of working point for pump pressure filling system

图5 不同管路流阻下泵压加注系统工作点移动图<br/>Fig.5 Movement diagram of working point for pump pressure filling system under different pipeline flow resistances

图5 不同管路流阻下泵压加注系统工作点移动图
Fig.5 Movement diagram of working point for pump pressure filling system under different pipeline flow resistances

图6 加注液位变化时泵压加注系统工作点移动图<br/>Fig.6 Movement diagram of working point for pump pressure filling system when the injection level changes

图6 加注液位变化时泵压加注系统工作点移动图
Fig.6 Movement diagram of working point for pump pressure filling system when the injection level changes

图7 CN80-315型离心泵实际工作曲线<br/>Fig.7 Actual working curve of the CN80-315 centrifugal pump

图7 CN80-315型离心泵实际工作曲线
Fig.7 Actual working curve of the CN80-315 centrifugal pump

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备注

引言

1 离心泵加注系统简介

2 离心泵的工作特性

3 离心泵加注系统工作特性

4 离心泵加注系统工作点的确认

5 影响离心泵加注系统工作可靠性的因素分析

6 提高可靠性控制措施

7 应用分析

8 结论

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