继续教育的创新与发展,是建设创新型国家,培养创新型人才的有效手段和必要途径。继续教育工作的创新和发展,关系到继续教育目标和任务的实现,必须从认识上和工作实践上,切实提高对继续教育工作重要性的认识,明确3个方面的主要工作任务,把握好工作中的5个基本原则,实现5个方面的工作创新,完善4个方面的工作方法,发挥好继续教育在培养和建设高素质、创新型人才队伍方面的重要作用。

北京城建集团土木工程总承包部从2009年起,主要承担北京市轨道交通建设工程,先后承担了亦庄线BT工程、房山线、大兴线、九号线、十号线、七号线、八号线、十四号线等轨道交通建设工程,这是继奥运工程后,北京城建集团承担的又一项北京市重点工程。为了圆满完成北京市下

In this paper the one new type of three screw pump has been analyzed initially and compared with the 1:3:5 type three screw pump,then the paper put forward some advantages disadvantages and the operating condition of the one new type three screw pump,it has some academic value of exploration in broadening the operating condition of three screw pump.

In this paper the former line's deficiency of type B double screw pump has been analysed,then the paper put forward the improved model.By the sealing analyses,the double screw pump has been proved to belong to the sealing type after the improvement.By the calculation,we came to the conclusion that the actual pump capacity would be increased.At last there was a list of the main shaft section for making inspection data,providing with reference data model.

目前,现有船用水喷射泵行业标准已不能满足我国水喷射泵专业和造船行业发展的需要,开展船用水喷射泵国家标准的研究显得尤为重要.此次船用水喷射泵国家标准研究,主要集中在大流量水喷射泵的验收、性能参数范围、结构型式等方面.通过制定相应的国家标准,可以使我国船用水喷射泵的设计、生产能力进一步提高,增强国际市场的竞争力.

The size of screw center angle α of three screw pump has nothing to do with flux of the pump, and then α angle is demonstrated to relate directly to the wring moment by medium on the screw surface. Only the wring moment is minus, the self-rotating wring moment on the driven screw medium will be created by the medium. The paper also demonstrates that the conclusion that α is equal to 0.18π presented by А.Е.Жмудь that is widely adopted in our country is false, and deduces that three-screw pump has the perfect running state if α angle is less than 0.166027π. The perfect running state means that the rotation of the driven screw is not driven by the active screw, but by the medium, and the function of the driven screw is only as the sealer. Finally, the paper explains that the quartering screw shape made by few manufacturers is not perfect, and the unperfected screw shape results in the fall of the mechanical efficiency and life.

This paper introduces the characteristics of screw pumps at first,then explains why the main engine lubricating oil pumps of warships must choose five-screw pumps,not three-crew pumps,and explains on the running faults of this five-screw pumps which are often apt to be ignored through combining its particular structures and characteristics.

文章阐述了轴向速度、排出压力、介质等因素对三螺杆泵吸上性能的影响,并介绍了试验时判定发生汽蚀工况点的方法和依据.