[第五章执行器05.ppt

5.执行器(Actuator) 5.3.4. 调节阀的可调比 ——反映调节阀的调节能力的大小 定义:调节阀所能控制的最大流量和最小流量之比 调节阀前后压差的变化，会引起可调比变化，将可调比分为理想可调比和实际可调比。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (1) 理想可调比 (ΔP 一定) 由结构设计决定 R=30 ; 50 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (2)实际可调比 Rr (ΔP 变化) ①串联管道时的可调比 设 则 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. ②并联管道时的可调比 R ＞＞1 设 则 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 5.3.5. 调节阀的流量特性 介质流过调节阀的相对流量与相对位移（即阀的相对开度）之间的关系 调节阀前后压差的变化，会引起流量变化。流量特性分为理想流量特性和实际流量特性 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. ① 理想流量特性 (ΔP 一定) 调节阀的固有特性，由阀芯的形状所决定。 理想流量特性主要有直线特性、等百分比（对数）特性、抛物线特性及快开特性等四种 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (1) 直线流量特性 调节阀的相对流量与相对位移成直线关系，即单位位移变化所引起的流量变化是常数 特点：a.放大系数是常数 b. Q 流量相对变化值 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-201