共查询到18条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Hydraulic butterfly valves have been widely applied in marine engineering because of their large switching torque, low pressure
loss and suitability for large and medium diameter pipelines. Due to control problems resulting from switching angular speeds
of the hydraulic butterfly valve, a throttle-governing control mode has been widely adopted, and detailed analysis has been
carried out worldwide on the structural principle concerning speed-regulation and the load torque on the shaft while opening
or closing a hydraulic butterfly valve. However relevant reports have yet been published on the change law, the error and
the influencing factors of the rotational angular velocity of the hydraulic butterfly valve while opening and closing. In
this article, research was based on some common specifications of a hydraulic butterfly valve with a symmetrical valve flap
existing in a marine environment. The throttle governing system supplied by the accumulator to achieve the switching of the
hydraulic control valve was adopted, and the mathematical models of the system were established in the actual conditions while
the numerical simulations took place. The simulation results and analysis show that the rotational angular velocity and the
error of the hydraulic butterfly valve while switching is influenced greatly by the drainage amount of the accumulator, resulting
in pressure loss in the pipeline, the temperature of hydraulic medium and the load of the hydraulic butterfly valve. The simulation
results and analysis provide a theoretical basis for the choice of the total capacity of the accumulator and pipeline diameters
in a throttle governing system with a hydraulic butterfly valve. It also determines the type and specification of the hydraulic
butterfly valve and the design of motion parameters of the transported fluid. 相似文献
12.
13.
文章以极地船海水冷却系统中的蝶阀及管道为研究对象,在Fluent平台上采用RNG k-ε湍流模型及DPM模型,计算得到了海水—冰晶两相流在蝶阀管道中的流场特性及冲蚀磨损,并选取3个有代表性的蝶阀开度即30°、60°和90°的计算结果进行对比。研究结果发现:蝶阀的开度越大,流场越稳定。各开度下阀板前、后缘与管壁间都存在2个高速区,且阀板前后压差随开度增大而减小,阀板后存在负压区域,涡流现象随开度增大逐渐消失。此外,蝶阀开度越大,蝶阀受到冰晶颗粒的冲蚀磨损越小,最大冲蚀速率也随之减小。研究还得到了蝶阀管道受冲蚀磨损较严重的位置,为船用蝶阀在不同工况下提供科学预测和参考。 相似文献
14.
文章介绍了新研制的通风蝶阀控制系统,对其微型液压系统、应急手动液压操纵器、电机控制逻辑电路的工作原理进行了分析,并对新型控制系统的组成、功能进行阐述,论证了控制系统的有效性和先进性,通过样机研制和实船应用取得了较好的工程效益,为今后同类蝶阀的研究提供技术参考。 相似文献
15.
水力式升船机通过控制水流实现对升船机运行特性的控制,流量控制阀是水力式升船机的重要控制设备。结合景洪水力式升船机的水力学特性,比较了蝶阀、球阀及活塞阀的抗气蚀性能及过流能力,通过比较选择活塞阀作为流量控制阀。根据水力式升船机上下游对接精度要求高、空中运行要求快的特点,对流量控制阀的多种组合方案进行比选,创新提出了主辅阀门控制方案,辅阀小流量主要负责上下游对接,主阀大流量主要负责升船机空中运行,最终确定1台E型活塞阀为主阀、2台SZ型活塞阀为辅阀的阀门组合设计方案。景洪水力式升船机已正式投入试运行,流量控制阀设计方案经受了工程实际检验,研究成果可供类似工程参考。 相似文献
16.
17.